Merge multiple variables stata If you want to merge several files at once, this is the way to do it, strictly one at a time. If I merge 1:1 on the id variable wouldn't that lose the time series? If so I don't know how else to merge the data. in Subject X' that means the author has completed their Ph. Hello everyone, I have a data set of unique customers (rows) and up to 10 of their suppliers (columns). So I read that I need to create a list of my datasets first, when creating a list of foreign datasets, do I also need to read them into R using read. 1 Answer Sorted by: Reset to default 1 Getting good answers HI, I'm trying to create variable wave (values 1-13) based on whether people were interviewed at each year (0,1). clear set more off input /// str1 AssetManager Bankcode A 1 B 2 B 3 C 3 end tempfile first save "`first'" clear input /// Bankcode str2 t 1 t1 1 t2 2 t1 2 t2 3 t1 3 t2 end joinby Bankcode using "`first'" sort AssetManager When we work on data analysis we first need to merge data or combine data in a single file. All features. Stata is a powerful data analysis software that allows you to manipulate and analyze data from multiple sources. Append is used when u want to add additio Merge (Stata Version 11 or higher) Basics. gen latinxurban = (race_r == 1) & (placeofresidence == 1) I am trying to "combine" two categorical variables in Stata (say var1 and var2) into a new (also categorical) variable (say res). None of them is named merge. Comparing multiple string variables for similarity 08 Jan 2019, 11:38 This made it easy to do a find/replace or a merge (or VLOOKUP in Excel). This seems like it would not be a rare problem, but I couldn't find anything directly addressing it except this researchgate topic. com merge — Merge datasets SyntaxMenuDescriptionOptions Remarks and examplesReferencesAlso see Syntax One-to-one merge on specified key variables merge 1:1 varlist using filename, options Many-to-one merge on specified key variables merge m:1 varlist using filename, options One-to-many merge on specified key variables merge(varname) specifies the name of the variable that will mark the source of the resulting observation. By ID, uniquely expanding multiple columns. Assume seniornurse is such a variable. longitudinal data). See[D] joinby when you want to combine datasets horizontally but form all pairwise is there a STATA command that I could use to collapse my dataset. Upon merging, I learned that the two datasets have at least 20 variables in common - some are strings in one dataset, and floats in others. Modified 7 years ago. We therefore write: In [7]: drop _merge Combine datasets with different types of observations - merge m:1¶ Now let's say that we have a dataset of individuals, where the data shows each persons gender and his or her satisfaction with Greetings Stata Users: I am trying to generate a variable that has the categories of the outcome of interest (1 being the outcome of interest) that I generated from another variable (race and place of residence). 0. If you rename variable Y to match the ID variable name in the other dataset (i. You can merge two or more variables to form a new variable. If we merge dads with kids, there can be multiple kids per dad and hence this is a one to many merge. You also give no --- John A Stefanic <[email protected]> wrote: > I'm having a lot of trouble combining dummy variables and creating a > new variable where I count dummy variables. Step 3: Merge on every pair of key variables With three key variables, the possible pairs are (personid, date), (personid, division), and (division, date). As you see below, the strategy for the one to many merge is really the same as the one to one It is not clear to me what you seek here. Because we typed (median) medinc=income, Stata knew to find the median for income and to store those in a variable named medinc. I need to match two datasets on three variables. Collapsing multiple variables 28 Apr 2014, 12:38. d using data1, varlist local v1 "`r(varlist)'" d using data2, varlist local v2 "`r(varlist)'" local both : list v1 & v2 u data1 keep `both' Then you need to merge with data2: the syntax will depend on which variable(s) act as identifiers. This example is dopey but nevertheless reproducible by Stata users using any recent version of Stata. I'm not trying to merge any variables or values among my Variables(1 to 6). Frequently data collection results in a collection of many variables. I want to merge them into one data set to conduct time series analysis, but am not sure how. I want a new set of variables as shown on the right: Merge in SAS usually means to combine data sets by rows in some fashion. I have made sure that the variable names are the same across the different datasets. com MERGE has behaviors that SQL Join doesn't. You can reshape from wide to long later if you want to reorganize the Either you will sort the data or merge will sort it for you. Is there a tutorial out there that shows how loops are coded in Stata? Thanks, Jeff At 12:33 PM 7/9/2006, you wrote: In addition to looping across the variables, you could -collapse- and -merge, update- to replace the missing values with average prices. combine merge adds variables to the existing observations. csv files, and converted the variables from string to numerical so that all of the "NA" become missing data points, but I We may use the fuzzy match / fuzzy merge technique in that case. csv et converti les variables de chaîne en numérique Next come the identifier variables, two in this case, that tell merge which observations should be matched. For each country and city combination, I need to create a variable which needs display the city and country in one I am currently aiming to create an identification variable in order to identify the flight route of an observation. . You might need some renaming before/after each merge to avoid variable name duplication. Below is my attempt at this, but it is not working. destring TITULAR, replace TITULAR: contains nonnumeric characters; no replace. I want to merge them to the same columns. The challenge, of course, is to merge the In this video, we explained how to merge data in stata. For example, in one But I also have a question for you: in your example data, in each observation, only one of the four variables has a non-missing value, so you aren't really concatenating anything. But the coding is not working, please help. 5 2005 2 3. 2. Notice that there is no ID variable—Stata simply added the new variables. Stata merge I have two columns in my dataframe. We use either reclink or matchit commands of Stata to conduct fuzzy merge. I have reset max number of variables to 32000 (set maxvar 32 Statistics > Multiple imputation Description mi merge is merge for mi data; see[D] merge for a description of merging datasets. csv files that we need to clean up and merge together. ; Add new observations to already existing variables using append. Import data sets in . 2 . I want to combine all of the observations that share an id and a date in How to merge data in stata. If string make sure the categories have the same spelling (i. Now individual’s name does not uniquely identify observations Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I am merging two datasets in Stata, both of which have more than 300 variables. We'll talk about handling duplicate identifiers shortly. Table 1 includes Date, ID, and Sale record. webuse nhanes2l (Second National Health and Nutrition Examination Survey) . There are diff I imagine I would have to create some sort of j variable, but am not certain how to make it so each event_date could have multiple codes, It is almost axiomatic among those who respond to Stata questions both here and on Statalist that, with few exceptions, Stata makes it much more straightforward to accomplish complex analyses using a long organization rather The use of merge m:m is discouraged (read the corresponding entries in the Stata manuals), and many people support its elimination. edu A common problem in data management is combining two or more variables with missing values to get a single variable with as many nonmissing values as possible. For each country and city combination, I need to create a variable which needs display the city and country in one variable and should look like this : New York, USA. The standard fuyyzmerge generate some issues by fuzzy-joining all three variables. nolabel prevents Stata from copying the value-label definitions from the dataset on disk Stata: combine multiple variables into one. The different point sizes represent different How can I use the merge function with @variables in Microsoft SQL Server Management Studio 2008 r2? All of the examples that I have searched for online use tables to merge into tables. Is there a way to assign the 4 different values of e. Otherwise numeric variables are pushed through string() -- Stata now prefers the name strofreal() -- which is what is biting here. Step 6: Run the Merge Command. Example 3 We can drastically reduce the size of our dataset by encoding strings and then discarding the underlying string variable. One is "Appending," and the other is "Merging. How to merge duplicated rows. In short, we use fuzzy merge when the strings of the key variables in two datasets do not match exactly. All regions and subregions are given short (often numeric codes, but stored as strings), and these are pasted together such that the No; this isn't a simple question because you just give a word description of your data and assume that it's transparent. It's particularly helpful to copy commands and output from your Stata Results window and paste them into your Statalist post using CODE delimiters, and to use the dataex The 2 variables I wish to combine are within the same dataset and are 2 variables out of 1000. dat extension to convert to Stata/SE and append, with substantial number of variables (varying from 81 to 16800). For a fuller view of your data, go Learn how to download, import, and merge multiple datasets from the NHANES website using Stata. When merging multiple datasets, it’s important to keep track of the order in which the datasets are merged and the common variables used, as this can affect the final merge 1:1 n performs a sequential merge. That is quite common for us working with register datasets, where different variables are kept in different files. Functions are the unsung heroes of Stata. gen whiteurban = (race_r == 0) & (placeofresidence == 1). 4 I would like to turn it into this Merge (Stata Version 11 or higher) Basics. So, do you want to add 35 variables to the observations in the original data set or does all 35 data sets have new I need assistance with getting a Stata code that can get me unique combinations of varibles. I suggest you always use Stata's merge or append commands to combine datasets and keep track of what you did using a . If there is different information on the other variables, tell us more about Merge •Adding Variables Stata 12 Merging Guide . At least least some of your observations contained strings Thank you for your repliesI did not realize that the m:m command will lead to a false match. 1:1 MERGE (merge on multiple variables) Now imagine a case where we observe height and weight of different individuals at different points in time. sysuse census, clear local S Alabama "Rhode Island" foreach s of local S { histogram medage if state == "`s'", saving("gg`s'", replace) local gg `"`gg' "gg`s'""' } graph combine `gg' In future, use . count if q1 == "Stata" or if q1 is a numeric variable in which Stata is represented by 5, type . Salut tout le monde, Je suis un cours d'épidémiologie où ils veulent que nous nous entraînions à utiliser des données du monde réel. If q1 is a string variable, type . Merging multiple files in Stata refers to the process of combining two or more separate datasets into a single dataset. Stata/MP. So when you ask Stata to -drop merge- it appropriately complains that there is no such variable. To run the merge command, you need to use the run command in Stata. Commands to reproduce: PDF doc entries: webuse auto scatter mpg headroom turn weight [G-2] graph twoway scatter: Learn about Stata’s Graph Editor . , country, state) and time (e. This is useful when you want to create a total awareness variable or when you want two or more categorical variables to be treated as one variable in your tables. Your new friend is the MCS Data Handling Guide which includes stata code for things such as this (see section 1. Merge Is there a way of merging in Stata when the keys might be mixed in different variables? Hot Network Questions If the author of a book is described on the jacket as 'A Ph. That way you don't have to create a new variables. They are both yes/no variables, both of them coded as 0=no 1=yes. Consolidate different variables to one variable . use one, clear . If drugA is administered to a patient, the variable shows ‘yes’, if not, it shows a ‘no’. Scatter and line plots : Main page Next group: Products. See [U] 23 Combining datasets for a comparison of append, merge, and joinby. Disciplines. Why Stata. An example: V1: A, B, C V2: 1, 2, 3 A1 A2 A3, B1 B2 B3, C1 C2 C3 I have 114 files with . In actuality, I have more linkage variables, such as 5-digit ZIP-code, year, race, gender and age groups making a use proc sql by multiple variables challenging. Lachenbruch Oregon State University (retired) Corvallis, OR peter. dta is the name of the data file that contains the data to be merged, and nogen is the condition that defines the relationship between the two variables. I would like to combine multiple categorical variables into one variable. One-to-one merging: Command: merge 1:1 varlist using filename For this command “1:1” specifies that there is one No; this isn't a simple question because you just give a word description of your data and assume that it's transparent. If you want to store this data in one variable, then that is typically done in the form of a string variable. mi provides both the imputation and the estimation steps. Again, we want to merge those two files. If there is an unequal number of merge adds variables to the existing observations. If you are tight on memory reclink will not merge in values of shared variables from the using dataset without warning the user. Remarks are presented under the following headings: Finding the smallest values (and the largest) Tracking sort order Sorting on multiple variables Descending sorts Once you have identified all the variables you need, and know what the ID variable(s) are, you can begin to merge the datasets. Hot Network Questions I’m British passport Holder and my son has I've 2 datasets I need to merge (one with accident data and one with cost data), but the one "unique" variable they have in common (Social Security Number) won't work since there are multiple occurrences of the same individual. If rename whatever pre=: Adds prefix pre to all variables selected by whatever, however whatever is specified. The example below illustrates what I am trying to achieve: var1 Merging with mi data containing overlapping variables Now assume the situation as directly above but this time nurses. My task is to merge this data without manually changing anything in them. Each id may have multiple dates, and so will have multiple records (i. Stata: Combine summary statistics into one column using esttab. All the variables in the dataset relate to different questions in a survey. dta contains variables other than nurseid that also appear in ipats. It is recommended that the match variables (varlist in the syntax diagram) not include imputed or passive variables, or any varying or super-varying variables. E. As an example, suppose I have two countries and two years. Further, this is stated to be about Stata, but you make minimal effort to use Stata terms to describe your problem. Could I be using the wrong command? Or perhaps the string variables, or multiple string variables, are confusing Stata? I'd like to learn how to cleanly add future observations to my master dataset. We will now focus on the two primary types: ‘one-to-one’ and a ‘one-to-many’ (or ‘many-to-one’). Unfortunately, the spellings of firm names are different across the two datasets. This kind of question bolsters my prejudice that the functions (including -egen- functions) are one of the most neglected parts of Stata. When merging categorical variables, the new variable will automatically have the same categories as the categorical variables you are Let’s begin by typing webuse nhanes2l to open the NHANES dataset and then typing describe to examine some of the variables. You can create frames, and delete them, and rename them. Values of numeric variables are converted to string, as is, or converted using a format under option format(%fmt) or decoded under option decode, in which case maxlength() may also be used to control the maximum label length used. Every row will be a unique combination of all 7 variables. dta’ has repeated registration numbers corresponding to their How to merge multiple STATA files using common variable . For instance, we have a data that has a title “Wage across race and gender”, which shows that in the following graph wage pattern across different genders and race is found. You even sort data to put it into a more convenient order when using list. Merging two observations . The identifier variables must exist in both data variable containing the median of income—medinc. Numeric variables may have value labels and if you want the value labels, not the values, to be concatenated, you must specify the decode option. How do I merge these to tables to get a table of the columns: Location, X, Y when the identifiers have a different name? Next come the identifier variables, two in this case, that tell merge which observations should be matched. The challenge, of course, is to merge For creating variables based on existing ones, the best first stop is help egen. This column is a tour of functions that might I am trying to create dyads in my Stata data set for multiple variables, at the same time. You can loop over While merging two panel datasets, for example, look for two common variables: entity id (e. How can I fill values from duplicates in Stata? 0. 2011. Using the merge command: This is the most common way to merge data on Stata. If you want to do what in database speak would be a 1:1 join, that’s usually called merge in Stata. The data has 20 categorical variables and only one entry is filled per person with the remaining 19 all missing. However, when multiple histogram graph types are specified, bins are constructed separately for each series. 1 Introduction to merge and append. 0g * High blood pressure age byte The variable valC1_g2 indicates that value_C1 is > 2. Purchase. mean_var1 to all the observations in the original dataset, based on whether a participant belongs to treatment group 0 or 1 AND region group 0 or1? So a participant with treatment=0 and region=0 would get assigned the multihistogram allows Stata users to easily construct overlaid histograms with aligned bins in Stata. If other variables are interspersed among them, then you cannot use that shorthand and you will have to enumerate the 16 variables in the -foreach v of varlist- command (or find a different shortcut that correctly identifies these and only these Actually, I can do something easier than that: I can add variable sex to the key variables of the merge:. So your new variables are named gh1, ed1, hm2, and iin1. Hello all, I have searched on the web about something that I still can't understand and that's why I'm posting here. D. rename whatever =jan: Adds suffix jan to all variables selected by whatever. The process is similar to merging two datasets, but with the added step of specifying which dataset is being merged into which. if subway line and date are unique, you can merge using both these variables merge 1:1 line date using [dataset] see help merge for more . mi’s estimation step encompasses both estimation on individual datasets and pooling in one easy-to-use procedure. Bookstore. You can go . with keep, I could select a block of variables, very simple: keep varx1-x5 However, the variables I want are not in order in the dataset: Hello: I have 21 tables and I would like to merge them all into one table. I once floated the idea of a Stata training course going through the functions with lots of examples, particularly in terms of combining functions. 1 or 14. Select the variables or variable set from the Data Sources tree that you want to merge. In Stata 16, there is an alternative to merge Stata: combine multiple variables into one. How to merge and duplicate observations and variables in Stata? 1. merge 1:1 n performs a sequential merge. In the test1 database, I have multiple executives for each year and each company. The nogen condition is used to specify the type of join. The default name is merge( merge). Stata: expand by the number of variables. In Excel it's Data > Remove Duplicates. How to merge and duplicate observations and variables in Stata? 0. Below on the left is an example of my database. This video shows how to merge data in Stata. I imagine I would have to create some sort of j variable, but am not certain how to make it so each event_date could have multiple codes, It is almost axiomatic among those who respond to Stata questions both here and on Statalist that, with few exceptions, Stata makes it much more straightforward to accomplish complex analyses using a long organization rather The two categorical variables are combined lengthwise. Nick [email protected] John Ataguba Thanks Nick. 2, -dataex- is already part of your official Stata data merged; merge data_b data_a (drop=Id2000); run; You don't say anything about which "by variables" you might want to use from your subject line. dta, nogen. If you browse the dataset, you'll see multiple rows with the same MCSID. In each variable, 1 == Mentioned, 2 == Not > Some, but not all, of STATA data transformation commands are merge, append, joinby, cross, and reshape. %let But the coding is not working, please help. That ensures that each box plot will be the same size. We have already looked at I am working with a dataset with merged data from 2 survey rounds (2005 & 20011). It concatenates varlist to produce a string variable. This can be done using the “merge” command in Stata, which allows for the merging of datasets based on a common variable. How to add expand a data table based on table information. Desired result 'want' has all levels of both datasets. Let us illustrate this with an example involving program and registration numbers. By specifying holes, we persuade graph box to put graphs on two rows. What I need to do is merge on two variables - like SSN and accident date - but I can't figure out how to do this in Stata. The following command will be used to generate the graph with a title. One includes vaccination rates for the flu from 2000 to 2004 and the other contains vaccination rates for the flu from 2005 to 2006. This can be done using the merge command in Stata. Order Stata. nolabel prevents Stata from copying the value-label definitions from the dataset on disk The easiest solution is to merge on multiple variables, in this case region sub-region, and PC. Then adding variable sex does not affect the outcome of the merge because sex is constant within id. To preserve compatibility with earlier versions of joinby, merge is generated only if unmatched is specified. See[D] joinby when you want to combine datasets horizontally but form all pairwise Comment fusionner plusieurs fichiers STATA à l'aide d'une variable commune . For even more flexibility, you may need to abandon graph box and use twoway instead. dta (called the using dataset), matching on one or more key variables. Each variable (i. For example, generate a group_1 variable based on id. Two of the three variables do not present misspellings (by design). For example, you might want to know how many respondents use Stata. These 7 items are each different weight control behaviors (diet, exercise, pills, etc. If they are identical on all variables, there is no extra information, and it's cleanest and simplest to use duplicates drop to get them out of the way before the merge. Often when we are working with data sets it is necessary to merge or In this video, we discuss how to convert a categorical string variable into a numerical variable in Stata. Consolidate different variables to one variable. That is what the command does. The -egen newvar=concat(varlist) Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Merging variables. Data on multiple responses in this structure can be used immediately for many analyses. As you see below, the strategy for the one to many merge is really the same as the one to one gender really is a numeric variable, but because all Stata commands understand value labels, the variable displays as “male” and “female”, just as the underlying string variable sex would. See also Cox, N. By default Nothing looks wrong to me on this evidence. 2016 2 5. rename whatever pre=fix: Adds prefix pre and suffix fix to all variables selected by whatever. Unfortunately, most (if not all) of the other variables have different names. I would like to generate a new variable that is also a yes/no variable, and it is only categorized as a yes if the response is yes in both of the original variables. Both of the commands are useful for fuzzy merge. (merge will also do 1:m and m:1 joins, fwiw). Use the -dataex- command to show example data. lachenbruch@oregonstate. Features are provided to Solved: Hello, I am trying to use DO LOOP to merge multiple datasets with different names. The challenge, of course, is to merge the The id is stored in a variable ("unique_id"). Does anyone know of a simple way to find out how many other variables the datasets have in common without merging first? Geospatial analysis in Stata: Mapping multiple variables. If you want to create z based on two strings variables x and y, you can specifically use egen z, concat(x y) which concatenates (joins) existing variables to from a third one. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company MERGE . My data set is in wide format because I am taking averages across years (columns). append (and merge, for that matter) only work with Stata format data files. merge can perform match merges (one-to-one, one-to-many, many-to-one, and many-to- many), which are often called Merge (Stata Version 11 or higher) Basics. You also give no The common variables that I have are Country and Year. This lecture series is intended for economics, managem In #10 each -merge- command creates a new variable with the name specified in the -gen()- option. Suppose we have a dataset on patients and the drugs they have been administered. Above is a map showing the population density of suburbs in ACT, combined with ACT public school locations and population sizes. 3. You start with one file and then in succession merge other files. I have already imported these . n is not a variable name; it is Stata syntax for observation number. Please be aware of that as you can get very odd suggestions if there isn't any actual input data and desired shared by misuse of "merge". 0 . Merging two variables. 1 billion observations in Stata/SE and Stata/BE ; Sorting. If the pattern of only one variable non-missing prevails throughout your data, then what you really want is a new variable that just picks out the non-missing value I think there may be a solution to this problem, provided I'm not misinterpreting the issue. You need to sort the data (both datasets) by the id or ids common to the files you want to merge and save the files. (also with variable So, each observation does not have a unique identifier that is one variable. What you need to do is use the pnum variable to create a new ID that is essentially the MCSID + pnum, and then merge with that. , Origin_of_Company, City_of_Company, Index_of_Company). On nous a donc donné 6 fichiers . Learning Outcomes. e. But I couldn't achieve it by merge in data step as shown in demo below. 6 for detail on the parent datasets). To illustrate the two choices, suppose you have a dataset containing information about individual I have two separate variables country and city. There are two types of combinations. To install it, type in Stata's Command window: ssc install rangejoin rangejoin will pair each stay based on its date in and out (the bounds of the desired interval) and the visit date. Values of string variables are unchanged. If ssn is the only common variable, how do you determine which records match? If you do have the accident date info in both files, then it's a simple merge in Stata -- you can merge on multiple variables (see whelp merge) use accidentdata sort ssn accidentdate merge ssn accidentdate using costdata Then you would go back into the system, select household members as the unit of analysis and create a second extract with the additional variables. Stata: combine multiple variables into one. To process this faster, I want to select only some variables of interest and drop the rest. Observations unique to one or the other dataset are ignored unless Dear Stata listers, I have to merge two data sets. J'ai déjà importé ces fichiers . Viewed 16k times Part of R Language Collective 3 I have a dataset such that the same variable is contained in difference columns for each subject. This can be done with merge: Stata’s mi command provides a full suite of multiple-imputation methods for the analysis of incomplete data, data for which some values are missing. Data expansion so to create all possible combinations of two covariates. When merging datasets, you will try to match different information about the same cases, information that for some reason or other is stored in more than one data set (e. However, it probably The use of merge m:m is discouraged (read the corresponding entries in the Stata manuals), and many people support its elimination. Hi all, I am taking an epidemiology class where they want us to get practice using real world data, so we were given 6 . More informationhelp merge For merge to work, you need one or more variables to merge the datasets with. Is there a way of merging in Stata when the keys might be mixed in different variables? 0. You can’t have two “rows” for variable names in Stata, so at the end of the day your variables should be 2019q1, 2019q2, etc. Is there a way of merging in Stata merge adds variables to the existing observations. I finally managed to merge the datasets! The problem was, that the datasets had missing values, that were counted as duplicates, which I didn't realize when I How to merge data in stata. All dates have to be numeric so I pre-converted all dates to Stata dates in the examples Merge with Multiple Key Variables. The challenge, of course, is to merge This website uses cookies to provide you with a better user experience. The fuzzy match is required only for the third variable. I have 7 variables and I need to run a code that can give me a unique combination of all of these variables. I am aware that this question might be a newbie question, but I scanned various forums and guides in the last days without success. csv que nous devons nettoyer et fusionner. This renaming convention is necessary in this example because a variable named income containing the mean is also being created. - This guide discusses different data You have two datasets that you wish to combine. 2016 1 5. They all contain overlapping participants with consistent ID variables. Rachel Jones you said you imported a dataset with variable Y. As I said, the identifiers must have the same name in both datasets. I obtain the same results as typing merge 1:1 id using two. country names, etc. Default Stata allows users to construct overlaid histograms using the -twoway- graph command. I need to do it this way because I am going to merge for each year one different . You can change this assumption by using the update and/or replace options to use the using values. Variables are columns. dta. Please help me. If you are running version 17, 16 or a fully updated version 15. If there is an unequal number of Note: the use of the variable list q8_1-q8_16 is only correct if these 16 variables are located consecutively in your data set. merge 1:1 id sex using two Assume I have a valid ID variable. Add new variables to an existing data set using merge. Use xfill command to fill the missing values within a group. Because we've specified that this is a 1:1 merge, the identifier variable(s) must uniquely identify observations in both data sets. dta is assumed. Run a loop that merges the prescription set 30 times with each med from the list. When you merge two datasets, a new variable is created called "_merge". 4. Note the keepusing() option of merge. g. Sorting alphabetically solves most problems, but as you can I have these two datasets for instance, I am trying to merge them in Stata which usually requires the identifier variable to have the same column name. There is no data that I want to be lost. Merge creates new observations if they do not exist in the original data set. Merging two observations. In this example, data1. There are two commands to merge data i. We are in the process of fixing this now. The two datasets shouldn’t share any variable names except for the variables for matching. A cookie is a small piece of data our website stores on a site visitor's hard drive and accesses each time you visit so we can improve your access to our site, better understand how you use our site, and serve you content that may be of interest to you. You would then merge the files on the HHID variable. Since your requirement does not combine the data then that is not typically a merge. However, they differ in terms of functionalities. Stata can also join observations from two datasets into one; see[D] merge. We will focus on its applications and potential pitfalls. describe highbp age sex diabetes Variable Storage Display Value name type format label Variable label ----- highbp byte %8. You can drop the original med variables now and will have 30 new variables with medication names, and 30 flags. macro list Let's say you have a survey dataset, with 12 variables that stem from the same question, and each variable reports a response option for that question (multiple-response options possible for this question). do file. A sequential merge performs a one-to-one merge on observation number. You can rename it. , yes? Stata versions: merge 1:1 _n using filename However, the new Stata commands in versions 10 or later mitigate chances for mismatched variables and observations. Commented Jul 22, 2020 at 22:06 | Show 1 more comment. Hold down your Ctrl key to select multiple From Stata documentation. I am trying to combine these variables to create a single weight control behavior dummy variable that is coded as yes (did engage in weight control) and no (did not engage in weight control). Hot Network Questions Hotel asks me to cancel due to room being double-booked, months after booking Is it (always) better to build You should also check that your two datasets do not have any variables with the same names. ; Method. merge adds variables to the existing observations. Merge is used when you want to join tables, adding variables (columns). Note that the NHANES questionnaires can now be accessed at:ht Requirements. The first observation of the master dataset is matched with the first observation of the using dataset; the second, with the second; and so on. We also see if we want to combine them into a sing Match merge by multiple variables Posted 05-06-2019 09:25 PM (806 views) Hi, I am trying to match merge two large data sets having nine common variables (v1-v9) with 11 variables in total (random values put in as example):-----Dataset1: v1 v2 v3 v4 v5 v6 v7 v8 v9 v_a v_b Up to 120,000 variables in Stata/MP; up to 32,767 variables in Stata/SE ; 20 billion or more observations in Stata/MP; Up to 2. 1. How to combine various estpost sets in esttab. I intend to create a final table only containing the Thank you for your repliesI did not realize that the m:m command will lead to a false match. , X append appends Stata-format datasets stored on disk to the end of the dataset in memory. When you perform a merge, if you have the same variable in both datasets, Stata will automatically keep the master data as authority. I have six stata data files for each year 2013-2019. I've read various guides, but can't figure out why the datasets won't merge. See[D] joinby when you want to combine datasets horizontally but form all pairwise Merge with Multiple Key Variables. In one data set, each observation represents a subject with the individual's value for variable X. In Stata, you can remove duplicates using "duplicates drop". Please see oversimplified mock datasets. One-to-one merge. Hot Network Questions What do multiple volts mean? Wilcoxon Matched-Pair Signed-Rank and Correlation merge(varname) specifies the name of the variable that will mark the source of the resulting observation. To get that behavior you need to use COALESCE or COALESCEC function for every common variable. Normally I could of course do this with gen citypair = origin_city + dest_city The problem with this is that it gives you the following result: origin_city: des_city: citypair: NY: WA: NYWA: WA: NY: WANY: Both observations however service the same route, so I would like to Turn it into a Stata dataset. Append adds more observations (rows) to a data set, and merge adds variables (columns) to observations. See -help datatype-Code:. Therefor, I looked for a command in Stata that can match the string variables. ). The nub of the matter is shown by Now I want to combine all observations for Car per ID and Year into one single row while keeping the year-fixed and ID-fixed data (e. However, right now I have multiple observations with the same id and same date, but with different values on some dummy variables. Merge (Stata Version 11 or higher) Basics. Read the options of Commands of 1 to 1 merge, 1 to many and many to 1 merge are discussed here, If you need any help feel free to contact us!!roadtophd1@gmail. :, I have this dataframe, and there are three DVs, but they are in different columns (A,B,C) I am having difficulty appending datasets from multiple different years. That doesn't contradict what is said in your question about course_interest_1. ; A data set containing two or more variables or variable sets that you want to combine. Ask Question Asked 7 years ago. I want to combine all of the observations that share an id and a date in But I also have a question for you: in your example data, in each observation, only one of the four variables has a non-missing value, so you aren't really concatenating anything. The unique identifier is spread across TWO variables - "cluster" and "household". 8 2006 1 7. Rule 11: Wildcard = in new specifies the original variable name. * Loop that creates 1/0 variables foreach x in m1 m2 m3 m4 { gen yn_`x' = beforedate * `x' } * Loop that creates four dichotomous lag variables foreach x in 0 3 12 18 { gen lag`x' = refdate > (date + 30 * `x') } And I want to combine the loops into a single double loop. When using reclink, tempfiles can be especially helpful, since you will likely need to be Therefore I would like to generate a variable combining two string variables (Origin and destination). In this video, we look at how to merge two d I have a problem in Stata. Table 2 includes Date, ID, and Sale price. count if q1 == 5 You do need to use that recipe to generate a new variable and in any case merge requires one or more variable names on which to merge (not expressions). There are 13 variables so AIWWAVE is 1992 data on yes/no interview that year. 0f") If you want to attach the names to the county code, you'd need to download a list from elsewhere and merge into your data. If you do not have a by variable merge will match the first row of the sets, then the second and so forth. I want to use the Platforms database as my base and merge the test1 on it so that I get for one year multiple executives but the same number of traffic in each row for that year. The Stata Journal 11(3): 460-471 Abstract. I am trying to combine all of these variables into one, so that I can do cross-tabs with other Another kind of merge is called a one to many merge. xx represents any given value of the data (didn't put values so it wouldn't look messy) Thanks! I'm not sure I understand. You need to repeat these two steps with different id variables constructed from different underlying variables, depending on the exact dataset. Is this po I just started working on a massive dataset with 5 million observations and lots and lots of variables. If the pattern of only one variable non-missing prevails throughout your data, then what you really want is a new variable that just picks out the non-missing value There's a new user-written program called rangejoin on SSC that is tailor-made for this type of problem. " Appending adds o The problem is that dataset 2 contains multiple observations per patient ID because the ICD-10 code was registered every time the patient had a consultation at the hospital. Stata: Removing Non-unique duplicates. Hello, I am a relative newcomer to STATA and experiencing the following issue. In another data set, each observation represents a range of values for variable X. The response options Title stata. If you want to use the by varlist: prefix, the data must be sorted in order of varlist. Stacking variables for each unique ID. gen county=state+string(number,"%02. In the dialogue box that opens, fill out the fields in the ‘Main’ and ‘Options’ tab as required: Press To merge two data sets, follow these steps: (1) Sort both data sets on the common identifying variable and save them to disk sorted. If idusing() and idmaster() have the same variable names, matches might not happen properly. 8 2006 2 4. If the OP's problem is that the unique identifier used to merge the two data sets is named differently in the using data set, then I think one can use a combination of -cfvars- to obtain all variable names from the using data set and -mmerge- to loop merge attempts between the two I have two datasets each containing data on certain firms. This causes the data to get messed up when appending This website uses cookies to provide you with a better user experience. If there is an unequal number of The id is stored in a variable ("unique_id"). Append is used when you want to “stack” datasets on top of one another, adding observations (Stata’s word for rows). Ascending or descending sorts ; Multiple-key sorts; Numeric and string sorts; Locale-aware Unicode string sorting and comparison ; Combining datasets. dta format. The identifier variables must exist in both data I am trying to find a way to merge data sets according to a range of values, sort of a combination of m:1 merge and inrange(). Try joinby:. (2) Use one of the data sets. That is an oversimplification because merge does not require that the datasets have the same observations. Show your commands and Stata results by copying them from your Results window or log file to your clipboard, and then pasting here in the forum between code delimiters. The codebook results for your total variable imply 126 people showed some interest -- making one or more choices --and 4 showed no interest in any. Stata Press. merge 1:m and merge m:1 specify one-to-many and many-to-one match merges, respectively. For instance variables common to both data sets other than the by variables replace values based on order of data set names appearing on the MERGE statement. Table 3 includes ID, Sale regions. How can I stack equations using estout? 0. Stata 12 Merging I want to generate a new set of variables that assigns a number in the sequence 1:n for each year observation of country i, and 0 for any other observation that is not from country i. duplicates is a general tool for managing duplicates. The identifier variables must exist in both data I have 2 variable which I am trying to combine into one. Any help gratefully appreciated! In my data set, I have multiple numeric variables structured like the Another kind of merge is called a one to many merge. . However, within the numeric variables, the labelling is different--so that in one data set Catholic=1 but in another one Catholic=11. dta ? Cool thanks a lot Joseph!! Joseph McDonnell schrieb: Johannes if the second variable is a string, you can concatenate it with state . ; 8. Only Nominal or Binary - Multi variable sets can be merged. So the workflow is to import each Excel sheet, save it as a Stata data file, and then merge. Is there a way, or do I Sometimes, it is necessary to combine two or more datasets. Below, we will draw a dataset as a box where, Below, we will draw a dataset as a box where, in the box, the variables go across and the We can merge the data using the menu option provided in the following sequence: Data > Combine datasets > Merge two datasets. How to add ttest results to esttab. Here is what I have: Year id Freedom 2005 1 6. One common task in data analysis is merging data from multiple datasets, which is How can I use the merge function with @variables in Microsoft SQL Server Management Studio 2008 r2? All of the examples that I have searched for online use tables to merge into tables. alternatively, you could create an ID variable too if you convert the date to a string. , year, month). Such variables—variables in common that are not used as matching variables—are called overlapping variables. When Stata launches, it creates a frame named default, but there is nothing special about it, and the name has no special or secret meaning. (Also, I would usually have the Investor_id there as well). I have 7 items/variables in Stata that address the same survey question. Below, we will draw a dataset as a box where, Below, we will draw a dataset as a box where, in the box, the variables go across and the Merging two datasets require that both have at least one variable in common (either string or numeric). , because one part of the information was collected earlier on and additional information has been obtained later). The following image depicts what the Prerequisites. Cleaning and merging data in Stata. Is there a way to specify which of the three should be fuzzy matched and which exact-matched? Stata: combine multiple variables into one. Familiarity with the Structure and Value Attributes of Variable Sets. Our dataset ‘std_names_multiple. I guess that your label size problem will disappear once 1 is solved. Just skip the -drop merge- command. When merging multiple datasets, it’s important to keep track of the order in which the datasets are merged and the common variables used, as this can affect the final We need to know about the duplicate rows (Stata's term is "observations"). Append •Adding Observations (Years) Stata 12 Merging Guide . This example was taken from the Stata manual on data management [D] and demonstrates a simple one-to-one merge. I would like to merge the two datasets using the only available option: the name of the firms in the two datasets. But that is redundant given recent versions of Stata. > > So, I have a dataset (GSS) with variables SPOUSE1, CHILD1, SPOUSE2, > CHILD2, SPOUSE3, CHILD3, indicating if person 1, 2, and 3 are a > spouse or child. merge is appropriate, for instance, when you have data on survey respondents and then receive data on part 2 of the questionnaire. It would probably be the least exciting and most tedious Stata course imaginable, but I think a lot of Stata users would realise how much they were missing. Applying one equation into values of multiple variables (Stata) 0. Mixing Merge & Append •You can only bind 1 direction (horizontally or vertically) at once. New in Stata 18. If any filename is specified without an extension, . Typically, this problem arises when what should be merge (?) multiple numeric variables 05 Aug 2014, 13:52. Often when we are working with data sets it is necessary to merge or How do I do a fuzzy match (approximately 75% match) between two variables in a Stata dataset? In my example, Matching observations based on a single variable or multiple variables on a single data set - stata. You merge when you want to add more variables to an existing dataset (type help merge in the command window for more details) What you need: · Both files should be in Stata format · Both files should have at least one variable in common (id) Step1. But instead of using a stat, I'd like to have new variables so no information is lost. So I would like to concatenate the entries into a new variable for easier analysis. dta’ has repeated registration numbers corresponding to their 3. clear set more off input /// str1 AssetManager Bankcode A 1 B 2 B 3 C 3 end tempfile first save "`first'" clear input /// Bankcode str2 t 1 t1 1 t2 2 t1 2 t2 3 t1 3 t2 end joinby Bankcode using "`first'" sort AssetManager merge 1:1 n performs a sequential merge. I am trying to calculate the average size of the suppliers in my data set per year, but this is complicated by the fact that In this article, we will learn how to convert categorical variables into numerical variables (Also look at destring and encode). The merge command allows you to specify the type of merge operation, the variables to use for matching, and the rename whatever pre=: Adds prefix pre to all variables selected by whatever, however whatever is specified. Much, much better to show a sample of your data with example values and variable names. – Nick Cox. MERGE merge joins corresponding observations from the dataset currently in memory (called the master dataset) with those from filename. Therefore I would like to generate a variable combining two string No headers. Thanks. This can be accomplished in Stata using multiple merge commands. In the original dataset I have 140 observations (each participant is one observation). How can I merge multiple files with this type of identifier? I am thinking I need to generate a new variable that references cluster and household, and repeat this across the multiple This can be accomplished in Stata using multiple merge commands. StataNow. I would suggest to create a new sheet in Excel and do something like =Sheet1!B$1&Sheet1!B2 to combine the first two rows, then import to Stata. The variables that I'm collapsing are like house1940, house1941 (with a previous You also seem to mix up append and merge. I am working with a panel data and I need to create a variable which will combine both city and country names: I have two separate variables country and city. response option) is numeric with yes/no options. For this purpose, it is possible to use merge. %let I have around 80 STATA datasets that I want to merge, they all got the variables var1 and var2 in common, but can differ in other variables (and the number of variables). Change your directory so that Stata can find your files. Both have a unique identifier. •If you’re combining both directions, you have to plan the order in which you perform your steps so that you never have to bind in 2 directions at once. I finally managed to merge the datasets! The problem was, that the datasets had missing values, that were counted as duplicates, which I didn't realize when I Duplicates across multiple variables 04 Oct 2017, 08:48. Quick start Datasets in memory are stored in frames, and frames are named. If one of them is ID2000 you can't because it is MISSING. HHID and a few other technical variables will become available for household members extracts next week In this video, we will examine how to combine datasets. For example: (I assume you meant price1, price2, since variable names cannot start with a number) preserve tempfile average Prerequisites. Fuzzy matching two data frames. Our one to one merge matched up dads and faminc and there was a one to one matching of the files. I would like a variable that indicates if each specific variable in Country2 has a match somewhere in the list of Country1 if valC1_g2. But, also This website uses cookies to provide you with a better user experience. append and merge. Sort and rank all data based on this variable. A cookie is a small piece of data our website stores on a site visitor's hard drive and accesses each time you visit so we can improve your access to Merge (Stata Version 11 or higher) Basics. merge is used with files on disk. with keep, I could select a block of variables, very simple: keep varx1-x5 However, the variables I want are not in order in the dataset: Pretty sure you mean append, not merge. csv and . merge 1/1 data1. I want to From your example, which implies numeric variables and at most one variable non-missing in each observation, egen 's rowmax() function is all you need. – Graphs generated in Stata can also have a title on top of it, depicting between what variables, the relationship is generated on the graph. This happens, for example, with tests or surveys where people answer questions on a 5 or 7 Dear Statalist, I am struggling with the "egen - concat" command to join the list of 4 variables into one new variable: Here is the example: If varlist is not specified, joinby takes as varlist the set of variables common to the dataset in memory and in filename. A series where I help you learn how to use Stata. I want to collapse more than 300 variables, and I'd not like to write them all (they are just 5 generic variables). In situations where a single key variable isn’t sufficient to uniquely identify records, we can perform a merge using multiple key variables. We have a string variable, sex, that records each person’s sex as Multiple overlaid scatterplots. Speaking Stata: Fun and fluency with functions. This is necessary if we want to add more data - Stata will not go through with the merge if there already exists a _merge variable in the dataset. If they do, the values of the match variables in m = 0 will be used to control the merge even in m Merge multiple variables in R. I would like to create a new id variable using HHBASE and PBASE in such a way that You have two datasets that you wish to combine. So you do have to import each Excel This means that all observations in your dataset had strings that Stata could translate to numbers (good!), and that Stata used a variable of type double for the variable to hold the numbers. See[D] joinby when you want to combine datasets horizontally but form all pairwise Next come the identifier variables, two in this case, that tell merge which observations should be matched. gen county=state+number If it's numeric, use the string function with a format . Create a sum of all the flags. The challenge, of course, is to merge Welcome to my classroom!This video is part of my Stata series. J. Stata tip 109: How to combine variables with missing values Peter A. ziyf vhqg bne amr yam hds thfipv ljftz xoxhx hkjx