Egen stata ucla Regression Analysis by Example, Third Edition Chapter 2: Simple Linear Regression | Stata Textbook Examples Re: st: egen command, multiplication. Hello Nick, thanks for quick answering. Regression Analysis by Example, Third Edition Chapter 2: Simple Linear Regression | Stata Textbook Examples The egen route is overkill if it means creating new variables for each original variable, just to hold the quartiles or the IQR as repeated constants. The syntax is (as stated in the > Reference manual): > > egen nwear = count(exp) > > I was wondering what this "(exp)" means (there is no example for this > particular type of egen). From Stas Kolenikov <skolenik@gmail. They are > available only > for -egen- and at no other place in Stata world. >> >> However, it was then suggested to me that I should be using sum >> [aweight=weight]. # must be odd. Official Stata’s egen contains the ma() function, which computes k-period centered moving averages (where k must How can I randomly assign observations to groups in Stata? | Stata FAQ The trick here is to create a random variable, sort the dataset by that random variable, and then assign the observations to the groups. I coded two very similar Mata routines, which are listed below. Could you please enlighten? A gloss on David's trick is as follows. bank margin 1995-1999 > > Can I do I believe the following will do the job: egen var1 = group (id title) Luciana Luciana M. Hello, I have a simple problem. Now I see what you meant before. -gen-, on > the other hand, > expects an expression behind the equal sign (gen varname = > <exp The goal in ordinary least squares (OLS) regression is to find the set of regression weight that minimizes the residual sum of squares. Nick Cox. -gen-, on the other hand, expects an expression behind the equal sign (gen varname = <exp>). x = 1;) to create a new variable in SAS, but what is the equivalent (or similar) command in Stata (by the way, there are actually three similar Stata commands, generate, replace, and egen). > > For example, I have variable GENDER (1: men, 2: women), Dear Statalist, I am using the egen, rownomiss command today and Stata says to me: unknown egen function rownomiss() All my files are up to date and FYI I am using Stata11 SE 32 bit on a 64bit Windows XP computer. I would like to create population totals by year and state. The expression can be any Stata function, and have their place at quite some other places of the Stata world (if <exp>, local macname = <exp>, `=<exp>', twoway function y = <exp On 2/6/06, daniel waxman <[email protected]> wrote: > If one performs -egen- across the entire dataset rather than -,by()- > then it returns what is essentially the same scalar for every observation. but in the numerical example I provided egen,sum() turns out to provide the exact answer (8. Thanks a lot for your help if you have already tried to figure out such a problem. Many researchers use Stata without ever writing a program even though programming could make them more efficient in their data analysis projects. findfile _ganycount. Please note: The following example is for illustrative purposes only. (Stata’s rmiss() only accepts numeric variables. Applied Longitudinal Data Analysis: Modeling Change and Event Occurrence by Judith D. The only difference I see is that -collapse- generates the new variable as datatype double where -egen- let's you choose, though the default is float. Very little > of what -egen, by()- does cannot be done with a few lines of -bysort-, > and it is often more lucid than the -egen- code. clear set seed 123 set obs 3 g byte group = _n in 1/3 expand 5 g byte var = int(10*uniform()+1) replace var = . 1, page 31. ssc install egenmore into a net aware Stata, or use -adoupdate-. Given that you want to do this, I'd recommend writing a parser that writes loops that call -egen-. In the following loop the egen command computes the group means which are used as the between group variables. Can I regress them on observations of another variable from only > a particular year? > > Example: regress per capita income in 1999 on average inflation from > 1995-1999 and on average bank margin from 1995-1999 OR > regress average per capita income from 1995-1999 on avg. g. This lecture series is intended for economics, management, and finance application. Thus, you can write, egen a = sum(sum(y)) The first "sum" is an egen The idea is to use the row egen functions to compute statistics on a rolling window. idre. edu: Subject Re: st:any easy alternative way when -egen- is not allowed to combine with by First, know that egen, pc() does not do this; it just scales each value to be a percentage of its own total. Techincally, egen is an "extension" to the egen command because it reaches beyond simple computations (var1 + var2, log(var1), etc. Stata’s most obvious command for calculating moving averages is the ma() function of egen. You can create an egen function 3abc, so that you would code egen a = 3abc(y) It could even be just a number!: egen a = 3(y) Of course, this is not a good idea, but the syntax allows it. April 2009 18:45 An: [email protected] Betreff: AW: st: Programming stata using egen functions <> " So in line 9 I substitute `scalar’ for `local’ hoping that rowmax() could now recognize the varlist. IS0 3166-1-alpha codes works quite well as marker labels in scatter plots of aggregated statistics. From "Nick Cox" < [email protected] > To < [email protected] > Subject st: RE: Fw: wtmean in egen: Date Tue, 6 Jan 2009 21:32:30 -0000 Multilevel Analysis Techniques and Applications by Joop Hox Chapter 2: The Basic Two-Level Regression Model: Introduction | Stata Textbook Examples This page shows an example factor analysis with footnotes explaining the output. The /* */ notation implies one line broken in two. I would like to create population totals by year and >> state. They are available only for -egen- and at no other place in Stata world. file whenever I try to include some egen functions like rowmax and rowtotal. Textbook ExamplesSampling: Design and Analysis by Sharon L. So I have a numeric variable "day" (which runs from 1 to 390) and another numeric variable - campaign statements (st) - that is daily (see below). You can use the sort command in Stata to acheive this. replace ss2 if wife==. The bigger issue is that -egen- does not take weights as such, so that use of -egen- with weights requires some work-around, for example the use of an option, as in -egen, xtile()- on -egenmore-. illustrate within regression ***** * associates within x within id with y within id * within regression 1 use xt, clear sort id by id: regress y x Nick, I knew we could count on you :-) This is great. Speaking Stata: Compared with Stata Journal 11: 305-314. Instead, the var for egen var=rowmin(varlist) is evaluated to zero or missing. newvar is missing for observations in which April 2009 18:12 An: [email protected] Betreff: Re: st: Programming stata using egen functions Thanks a lot for all answers!! Just to clarify some points: I understood that the egen functions rowmax() and rowtotal() did not accept scalar. The rowmean() function of egen calculates -egen, sum()- was cloned as -egen, total()- in Stata 9 for precisely the reason you identify. mean(exp) (allows by varlist:) creates a constant (within varlist) containing the mean of exp. Lovisa -----Original Message----- From: owner-statalist@hsphsun2. My solution turned out to be to replace all of the zeros in the seq* cells with missings, then execute egen byte minmath = rowmin(seq*) /*without the condition!*/ and add the following line of code: replace minmath = 0 if minmath==. Unfortunately, these functions do not accept time-series varlist (see help tsvarlist). Hmm. Willett Chapter 11: Fitting Basic Discrete-time Hazard Models | Stata Textbook Examples I am not aware of a command, but it should not be hard changing the existing -anycount-. Shige Song wrote: > I am trying to use "egen newvar = count()" to generate a set of variables > indicating frequency of old variables. 2. Cleveland Chapter 2: Univariate Data | Stata Textbook Examples Regression with Graphics by Lawrence Hamilton Chapter 8: Principal Components and Factor Analysis | Stata Textbook Examples The Stata command egen, which stands for extended generate, is used to create variables that require some additional function in order to be generated. 1)" and "[. & wife==. The same issue arises with -lastnm()-. Results of the mod(x,y) function . 1 Stata promoters—those who love Stata, encourage others to use Stata, and provide resources for others 2 Stata researchers—those who use Stata regularly for their own research 3 Stata novices—those who have used Stata for a short time and want to learn more K. You can also cut out the middle macro(s). The workaround is to use tsrevar to create temporary variables and use those instead. If you put the code in a do file, it runs fine, I think. Is there an alternative to using collapse (I would prefer not > to change the dataset) or having to introducing a matrix? > > Assume: > > Manuf Model Class Mpg > Chevy Tahoe SUV 14 > Toyota Highlander SUV 19 > Toyota Camry Auto 23 Shige Song wrote: > I am trying to use "egen newvar = count()" to generate a set of variables > indicating frequency of old variables. Here's an ad hoc step-by-step 1. > > Originally I had thought to use bysort id: egen pop=total(weight) > where id is the state-year. use bigmice, clear graph box weight, over(day) nooutsides So I type: sort CITY by CITY: egen nm=count(GENDER==1) by CITY: egen nw=count(GENDER==2) by CITY: egen np=count(GENDER) Stata generates all three variables with complains, but surprisingly, all three new generated variables are exactly identical (all equal the total number of people)! How are you figuring out the values in your collapsed dataset? It sounds like you are using -outsheet- to output the data (or are displaying it using -list-). Then we use the egen command to generate a variable with the mean across each row. 2 using the command cross. You mentioned the word "temporarily" earlier. -iso3166()- is especially useful for data from cross-country comparative surveys. 2011. Willett Chapter 11: Fitting Basic Discrete-time Hazard Models | Stata Textbook Examples The easiest way to convert string variables to numeric form is to use the encode command. Sin embargo, egen permite trabajar con funciones más complejas o algunas posibilidades que gen no permite. di round(8. input a1 6 -3 5 3 end save a1 rename a1 a2 save a2 rename a2 a3 save a3 rename a3 a4 save a4 use a1, clear cross The syntax of various -egen- functions was changed in Stata 9. For the first example, we will set the outer This Stata FAQ shows how to check if a dataset has duplicate observations. There is one, and only one, set of regression weights which minimizes the RSS. Starting with Stata 8, the duplicates command provides a way to report on, give examples of, list, browse, tag, or drop duplicate observations. -- Maarten ----- Maarten L. Regression Analysis by Example, Third Edition Chapter 10: Biased Estimation of Regression Coefficients | Stata Textbook Examples Yes. Case 1: Identifying What I want to do is to replace as many missing >> University names as possible, by assuming that: when a professor is >> linked to a university at least once in a year, she is linked to the >> same university during that year - so the missing university name when >> her name occurs again in the same year can be replaced (why there are Regression Analysis by Example, Third Edition Chapter 2: Simple Linear Regression | Stata Textbook Examples Using Stata/MP 14. mymean loghw > variable m_99 not found > r(111); > > So I would like to know why the program recognizes the max and sum egen > functions but do not recognize (or do not find my variable) when I use > the rowmax and rowtotal egen functions. egen sum, egen total, gen _n and so on. Do egen average=rmean(var1 var2 var3) It will take the average of all non-missing observations. Comment from the Stata technical group. From: "Nick Cox" <[email protected]> Prev by Date: st: RE: Fw: wtmean in egen; Next by Date: st: RE: RE: data management - changing every 1st encountered of a str data content of a var; Previous by thread: st: RE: Fw: wtmean in egen Use - reshape wide - to produce ss1husband and ss1wife then gen ss2 = . The first example is of income of four married couples from table 16. & husband==1 replace ss2 if husband ==. 1 for Mac, I have the same issue as Frauke: I get a type mismatch when attempting to count a string variable through egen. Not only could it be useful, but crucial, to sort your observations in a particular way when cleaning or creating outcomes. 07799 Iteration 1: log likelihood = -335. -egen- and -collapse- both use -generate-'s sum function. Join Date: Mar 2014; Posts: 34886 #2. I missed this reply earlier. In general, what advice what you give (I have some 150 variables): reshape the whole dataset back and forth?----- Nick Cox <mailto: [email protected] > April-05-11 18:09 Here is example code for a -reshape- solution. We skip the section on confidence envelopes. > > (Can we assume that income == revenue?) > > Nick **get the group mean (using id as group) without taking consideration of mising values foreach v of varlist Y x1-x8 { by id: egen mean_`v'=mean(`v') } In order to exclude the respondents with missing values for any variable in Y, x1-x8, of course I can write out the condition like Y<. This question gets asked about once a year on Statalist; that's not enough to justify bloating the help further. Of course you can order your observation based on ordering one variable, but egen a = 3(y) Of course, this is not a good idea, but the syntax allows it. This FAQ is likely only of interest to users of previous versions of Stata. In fact, some of the rows have all zeroes; the Line for the server "Thanks Martin, your memory is clearly better than mine to remember that from 2005!" That is very flattering for me, but I have only been around in earnest since spring 2008. edu egen— Extensions to generate 3 max(exp) (allows by varlist:) creates a constant (within varlist) containing the maximum value of exp. The table below shows you five columns of information. Second time around the loop, the problem is that -mean- already exists, and so the loop fails. Given an expression, it creates a #-period moving average of that expression. The command egen newvar = count( stringVar ), by( groups ) does not work ( type mismatch r(109); ). After loading the data set into Stata, we will use the count command to see how many cases we have in the data file. It's vital to understand that functions and -egen- functions are completely separate beasts. MacDonald (StataCorp) 6-7September2018 5/52 Collapsing data across observations | Stata Learning Modules Sometimes you have data files that need to be collapsed to be useful to you. A user-written command called meansdplot that will produce this type of graph. > inflation 1995-1999 and on avg. 1,. Thank you all for your help I ended up using the following: ***** foreach myvar of varlist structured- reg_num{ recode `myvar' 99=0 } egen sum = rowtotal(structured Thanks Nik. This solved my problem. How Stata handles missing data in Stata procedures. * between regression 2 use xt, clear egen xbar = mean(x), by(id) regress y xbar * between regression via xtreg 3 xtreg y x, be * 6. The data presented is not meant to recommend or encourage the estimation of random effects on categorical variables with very few unique levels. Regression Analysis by Example, Third Edition Chapter 10: Biased Estimation of Regression Coefficients | Stata Textbook Examples The issue Devra raises can be answered by looking at the code. I am a fan of -egen- when it's the right tool but I wouldn't start there at all. Let’s see how _n and _N work. -egen- functions are totally transparent. For example, you want to make a new variable and know you can use the assignment statement (e. Sort, by, bysort, egen Sort order . That creates an obligation to say which kinds of weights are supported. We will do an iterated principal axes (ipf option) with SMC as initial communalities retaining three factors (factor(3) option) followed by varimax and promax rotations. Alencar, M. Curso STATA 2015 domingo, 13 de diciembre de 2015. The original question did not make clear (to me) that Liling Independently of that -egen, cut()- does not sound the best bet for what I guess to be your problem. From "Martin Weiss" < [email protected] > To < [email protected] > Subject st: Re: what does -egen std- do? Date Wed, 1 Apr 2009 22:06:52 +0200 Yet another answer is to point out that the -if- condition can be written if !missing(y,x1,x2,x3,x4,x5,x6,x7,x8) Nick [email protected] Mandy fu I was wondering if anyone could give me some suggestion about following question related to --egen-- command. > > Is there any way to actually generate a scalar rather than a variable? > For example, I am interested in having a scalar or local macro which From "Martin Weiss" < [email protected] > To < [email protected] > Subject st: RE: what does _N mean under by varlist in the -egen- and -gen-? Date Sat, 8 Aug 2009 14:34:15 +0200 Some readings: FAQ . Some of the stuff that can be done with plyr and apply in R is generate may be abbreviated by gen or even g and can be used with the following mathematical operators and functions: + addition- subtraction* multiplication / division ^ power A large number of functions is available. Many thanks. -egenmore- is a bundle of functions for -egen- The collection consists of egen-functions from various authors, and an integrative help-file maintained by Nick Cox. use https://stats. Happiness! This problem is discussed at moderate length in Cox, N. One way to get started is to use the -collapse- command, or you could -egen- the statistic you want for the non-constant variables and then just take a look at the first observation for each individual: *-----BEGIN EXAMPLE clear inp year id offspring_born use https://stats. Some users are using Stata 9, and some a previous version. Not your question, but -egen, sum()- is a poor way to do a sum. Try this (and observe where Stata`s complaints start): ***** sysuse auto, clear egen newmpg=cut(mpg), at(12/41) drop newmpg egen newmpg=cut(mpg), at(12(0. As a general rule, Stata commands that perform computations of any type handle missing data by omitting the row with the missing values. Table 4. My colleague ran the same line on her Stata 11MP8 on her 64bit Windows XP and it didn't work either. Singer and John B. 75 If you want exact decimal calculations, you need to do all your workings in > A snippet of your data & some more info about what kinds of summary statistics you want to create would help. " Well, you have not passed a -varlist- to -egen, rowmax()- so it complains about its syntax statement not being respected, and rightly so Because I am working with large datasets I tried to code in Mata the equivalent to the following Stata command: egen newvar=mean(var), by(id) believing that the results would be much faster. Stata has two built-in variables called _n and _N. Hi Catharina, My first impression is that you may have not defined the data as time series by using -tsset-. These data were collected on 1428 college students (complete data on 1365 observations) and are responses to items on a survey. 01) 8. We only have the usual normal quantile plots without the confidence envelopes. Thus you need only find the highest such integer. The old names continue to work, but are not documented. Thanks to Kit Baum, the -egenmore- package on SSC has been updated. com> To statalist@hsphsun2. From "Klepsch, Catharina" < [email protected] > To "[email protected]" < [email protected] >Subject AW: st: Use egen command with time series operator: Date Thu, 28 Nov 2013 11:45:48 +0100 At 05:49 PM 1/31/03 +0000, you wrote: Watch two details among many others. Is there an alternative to using collapse (I would prefer not > to change the dataset) or having to introducing a matrix? > > Assume: > > Manuf Model Class Mpg > Chevy Tahoe SUV 14 > Toyota Highlander SUV 19 > Toyota Camry Auto 23 Another way to understand what's going on is to -set trace- and see what calls what. 2. > > My data looks like this > > Individual Year Reurn > 1 1 1,1 > 1 2 I am not knocking -egen-. 2 change line 7 from Dear Terri, Could you try this: egen rowsum=rowsum(seq*) egen byte minmath = rowmin(seq*) if rowsum~=0 Please note that minmath is greater than zero iff ALL scores for this observation is greater than zero. I have found it helpful in my own work to be able to use, and to write -egen- functions. For the first example, we will set the outer Sounds to me like you can avoid loops by making clever use of -reshape- and -by-, see their helpfiles. It counts the number of missing values in the varlist. 1, pages 94-95 * Model A xtmixed alcuse || id: , variance mle Performing EM optimization: Performing gradient-based optimization: Iteration 0: log likelihood = -335. Of course you can order your observation based on ordering one variable, but you can go further and sort your data on multiple This module shows how to create and recode variables. The egen route is overkill if it means creating new variables for each original variable, just to hold the quartiles or the IQR as repeated constants. To get this program just type the following into the Stata command box and follow the instructions: search meansdplot (see How can I use the search command to search for programs and get additional help? for more information about using search). N. UCSD - Hamilton Glaucoma Center Tel: 858-5345334 / Fax: 858-8220615 [email protected] 9500 gilman Dr. Thank you, Carlo Quoting "Nick Cox" <[email protected]>: I can't add to what I said earlier, or wrote much earlier as cited, except to emphasise that this function is here on a knife-edge: . An Introduction to Categorical Analysis by Alan Agresti Chapter 2: Two-Way Contingency Tables | Stata Textbook Examples by yrm: egen R9`X'= mean(c1ds_ri) if `X'==9 by yrm: egen R10`X'= mean(c1ds_ri) if `X'==10 } Why do you need all these variables? The results for bin are disjoint, so can be put in a single variable. Either way, it would probably be helpful if you share the solution that works for you with the list since others have probably had similar issues. As you imply, -egen- can lose precision if you use the default variable type of -float-; the remedy is not to do that, but that's not the crux here. Svend Juul and Morten Frydenberg’s An Introduction to Stata for Health Researchers, Fifth Edition updates their classic book that has become a standard reference for health researchers everywhere. Business Library L001D Mendoza College of Business University of Notre Dame Notre Dame, IN 46556 (574) 631-1450 mdeike@nd. 2 egen functions for time series There are also a number of egen functions that prove very useful with time-series data. mean(exp) (allows by varlist:) creates a Stata has some utility commands for creating new variables: The egen command is useful for working across groups of variables or within groups of observations. MacDonald (StataCorp) 6-7September2018 5/52 This video shows the benefits of using the bysort command in Stata. The egen cut command works well unless I have zero > observation in a category - rather than still creating that as a level of > the new categorical variable, Stata just doesn't form the category. Dawood, bys repdte state: egen sum = sum(asset) generate share = (assets/sum)*100 bys repdte state: egen HERF = sum(share) Rafa----- Original Message ----- From Stata SAS Chapter Title: Chapter 1: Introduction: Chapter 2: Chap 2: Chap 2: Two-Way Contingency Tables: Chapter 3: Chap 3: Chap 3: Three-Way Contingency Tables: Chapter 4: Chap 4: Chap 4: Generalized Linear Models: Chapter 5: Chap 5: Chap 5: Logistic Regression: Chapter 6: Chap 6: Chap 6: Log linear Models for Contingency Tables: Chapter 7 David Kantor's function cited here subverts -egen-'s lack of support for weights by allowing them to be supplied as an option. But in general do not look to -egen- when working with -svy:-. The encode command turns categorical string variables into encoded numeric Note: Because of differences in the algorithms used by the version of Stata used when creating this table and version 6, fewer iterations are needed to produce the same results. edu: Subject Re: st:any easy alternative way when -egen- is not allowed to combine with by Use - reshape wide - to produce ss1husband and ss1wife then gen ss2 = . Tags: data, egen, sum, syntax. I suspect that you wrote something of the form foreach v of var <varlist> { egen mean = mean(`v') egen sd = sd(`v') } where instead of <varlist> you had a list of variable names. One of the Mata routines is amazingly slow. Is there an alternative to using collapse (I would prefer not > to change the dataset) or having to introducing a matrix? > > Assume: > > Manuf Model Class Mpg > Chevy Tahoe SUV 14 > Toyota Highlander SUV 19 > Toyota Camry Auto 23 _n is the Stata way of referring to the observation number; in a 10-observation dataset, _n takes on the values 1, 2, , 10. In this example, we are taking a simple random sampling of schools. It is not customary to mention outdated names in the -help-. I want to demean variables Y, x1-x8 and then run an OLS regression of these variables for a panel data Philipp, No, I don't get an error code. 1, page 297-299 on data file ornstein. Stata programming is not difficult since it mainly involves the use of Stata commands that you already use. Comandos gen y egen Comando generate (gen) Al igual que el comando gen, su comando extendido, egen, permite crear nuevas variables. By default, # is taken as 3. This page contains only the I am using Stata 11. Masterov wrote: > When using egen with the cut option, is it possible to get nice value > labels for the resulting variable? Let's say I have some fake data: > > clear > set obs 100 > gen x = uniform() > egen bins = cut(x), at(0(. When _n is combined with by , however, _n is the observation number within by-group, in this case, within oldid . 2, page 105. 1. Yet another answer is to point out that the -if- condition can be written if !missing(y,x1,x2,x3,x4,x5,x6,x7,x8) Nick [email protected] Mandy fu I was wondering if anyone could give me some suggestion about following question related to --egen-- command. > > Note that explanations that assume proficiency in Excel _and_ Stata catch a much smaller set of people than explanations that assume proficiency in Stata. In Stata you can create new variables with generate and you can modify the values of an existing variable with replace and with recode. I think I will choose the reshape option: much more appealing. The trick to Stata programming is to use the appropriate commands in the right sequence. harvard. 895, 0. I have tested with the "anycount" command but it does not correct the problem. But egen comes into its own when you want to do this by groups: bysort foreign: egen mpg_upq = pctile(mpg), p(75) by foreign: egen mpg_loq = pctile(mpg), p(25) gen mpg_Q = mpg / (mpg_upq - mpg_loq) How can I randomly assign observations to groups in Stata? | Stata FAQ The trick here is to create a random variable, sort the dataset by that random variable, and then assign the observations to the groups. There are two methods available for this task. It teaches readers how to work in Stata effectively and how to perform statistical analyses that are foundational to those performing health research. 07799 Computing standard errors: Mixed-effects ML regression Number of obs = 246 Group variable: id Number of groups = 82 Obs per group: min = 3 avg = 3. The eps option is forcing Stata to do three more iterations than it StasK is correct. > > For example, I have variable GENDER (1: men, 2: women), I managed to figure out how to identify and subset my data to include only the matched pairs created by psmatch2. The second example will use a user-written program. What was (and still is) confusing me was that if I included the ate option, some of the matched pairs were "broken" and a member There are two easy ways to create dummy variables in Stata. LohrChapter 5: Cluster Sampling with Equal Probabilities Dear All I am having some problems with my ado. I trust you will be able to take it from there HTH Martin _____ ----- Original Message ----- From: "Augusto Cadenas" <[email protected]> To: <[email protected]> Sent: Wednesday, October 22, 2008 11:54 PM Subject: st: expanding on -egen rowmin()- Hello, I wanted to go beyond the command -egen rowmin(/varlist/)- and create a new variable From Stas Kolenikov <skolenik@gmail. _N is Stata notation for the total number of observations. Finally, the generate computes the within group variables. 2, page 32. I am aware of preserve/restore. I would call that a cumulative or running sum, and it is I would like to create population totals by year and >> state. -egen, group()- always produces integers 1 up. > > However, it was then suggested to me that I should be using sum > [aweight=weight]. The issue Devra raises can be answered by looking at the code. Visualizing Data by William S. Let’s begin with a simple dataset that has three levels of the variable group:. if group==3 sort group . 76 . Dave ----- PhD student, Harvard Economics Department Phone: (O) 617-495-5634, (H) 617 - 493 - 1536 Address: Currier Mail Center #554, Cambridge, MA 02138 ----- On Tue, 9 Nov 2004, Herve STOLOWY wrote: > Dear All: > > I would like to compute the average of tsmktim is available from the SSC archive via official Stata’s ssc command and may be located with findit. D. foreach X of varlist G* { bysort yrm `X' : egen R`X' = mean(c1ds_ri)} Having said that, it can probably done more directly with a series of I find the warning message issued by -egen = mode()- to be tremendously misleading and, in many cases, just plain wrong. Have you? Best, Alfonso Sanchez-Penalver > On Nov 28, 2013, at 2:52 AM, "Klepsch, Catharina" <klepsch@bwl. , Dept 0946, room 174 La Jolla, CA; 92093-0946 -----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Mike Kim Sent: Tuesday, January 06, 2009 Nick, I have a survey that was conducted over many days (390) with many interviews each day (58,373 cases total). edu Subject: st: summarize by different levels/groups with -egen- ? Dear STATA users, I want to summarize following: School Applied Longitudinal Data Analysis: Modeling Change and Event Occurrence by Judith D. From your word description it sounds exactly right to me! > > Please give a worked example of what you want for a minimal dataset. Quoting "Nick Cox" <[email protected]>: 3. Buis Institut fuer Soziologie So, your attempt: > recode min_add_sugar = mean(min_add_sugar) if r_add_sug != 0 could be: egen x = mean(min_add_sugar) if r_add_sug != 0 replace min_add_sugar = x if mi(min_add_sugar) & !mi(x) //last part probably isn't necessary, but I'm overly cautious with my conditions you mentioned using -sum- and macros, so here's an alternative approach Thank you all for your help I ended up using the following: ***** foreach myvar of varlist structured- reg_num{ recode `myvar' 99=0 } egen sum = rowtotal(structured Simple random sample in Stata. As Svend Juul in particular pointed out in various very entertaining talks in 2004, it was not a good idea to use -sum()- for cumulative or running sum in one context and the same name for Regression with Graphics by Lawrence Hamilton Chapter 8: Principal Components and Factor Analysis | Stata Textbook Examples The syntax of various -egen- functions was changed in Stata 9. 1. From: Scott Merryman <[email protected]> Prev by Date: Re: st: egen command, multiplication; Next by Date: st: how to program an equivalent of "egen mean" for an equation; Previous by thread: Re: st: egen command, multiplication; Next by thread: st: how to program an equivalent of "egen mean" for an Hi to all I am using the following command to get a row total for 16 variables: egen sum = rowtotal(structured- reg_num ) the possible values per variable are 1, 2, 3 Some readings: FAQ . Regression Analysis by Example, Third Edition Chapter 9: Analysis of Collinear Data | Stata Textbook Examples Version info: Code for this page was tested in Stata 12. I swear that this is my last email: I trying to calculate bounds on E[y(t)]. Don't try rewriting -egen-. Thanks to Stas, Sergei and Michael for some tips on speeding up things. > bysort Household: egen Dependants = count( REL) if REL==3 Note that this kind of bys Individual (Year):gen runningproduct = exp(sum(ln(Return))) Scott On Tue, Apr 30, 2013 at 7:00 AM, André Gyllenram <[email protected]> wrote: > Hello, > > I have a simple problem. But egen comes into its own when you want to do this by groups: bysort foreign: egen mpg_upq = pctile(mpg), p(75) by foreign: egen mpg_loq = pctile(mpg), p(25) gen mpg_Q = mpg / (mpg_upq - mpg_loq) HTH Martin -----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Rembert De Blander Sent: Friday, September 26, 2008 4:27 AM To: [email protected] Subject: st: bug in "egen" command? The problem can be stated as follows: Consider the panel data setting where the command <<tsset pid time>> was issued. If you can't see this in the help, you or haven't upgraded, or are on some previous version of Stata, or both. 86 + 4. ado . The first example will use commands available in base Stata. > > tempvar sumnew > bysort id: g `sumnew' =sum(indicator) > bysort id: g byte new=(sumnew>0,1,0) > assert To add to the confusion, not only do -egen- functions occupy a separate name space, but their names can begin with a digit. Examples of these function include taking the mean, discretizing a continuous variable, and counting how many from a set of variables have missing values. & st: AW: RE: Programming stata using egen functions. mdev(exp) (allows by varlist:) returns the mean absolute deviation from the mean (within varlist) of exp. _n is 1 in the first observation, 2 in the second, 3 in the third, and so on. ) to add descriptive stats, standardizations and more. Say that you use SAS but wish to know how to do a particular command in Stata. L. 76), which I can't get using collapse (sum). -egen- functions are only understood by -egen- and the only functions -egen- understands are -egen- functions. They happen when I save a permanent file containing temporary variables. Very likely, some users of Stata 9 are remembering previous syntax that continues to work. _n is Stata notation for the current observation number. Willett Chapter 2: Exploring Longitudinal Data on Change | Stata Textbook Examples Starting with Stata 8, the duplicates command provides a way to report on, give examples of, list, browse, tag, or drop duplicate observations. An Introduction to Categorical Analysis by Alan Agresti Chapter 8: Multicategory Logit Models | Stata Textbook Examples This chapter makes extensive use of the fitstat program, which is not part of base Stata. As it turns out, egen [var] = rowsum([varlist]) is equivalent to egen [var] = total([varlist]). > > HTH, > Billy > > Sent from Can you provide an example? In the simple example below, I believe -egen, ends()- is correctly separating the head from the tail in the long string (str229). It is the Stata function -sum" That is the weird thing: Just one letter ("e") differentiates the running sum from the total. change the file (don't save the changes yet) 2. a boxplot that includes a marker at the mean), you can do this <> " is the -egen- function -sum()-, but it isn't. 1)1) > > I would like to get value labels like "[0,. See[D] egen for more information. To my surprise the egen command was faster. You can obtain these programs by typing, search command_name, into the Stata command line and following the instructions (see How can I use the search command to search for programs and get additional help? for more information about using search). input group 1 1 2 3 2 2 1 3 3 end Essentially I would > like to combine the 'egen std()' function with the 'by' construct which is > not allowed. To install -egenmore- type . J. Case 1: Identifying duplicates based on a subset of variables Standard boxplots, as well as a variety of “boxplot like” graphs can be created using combinations of Stata’s twoway graph commands. This post is (By the way, there are actually three similar Stata commands, generate, replace and egen). The 11 observations with repair record 5 therefore have values 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1 and total 9, so that The percent() option was added to Comment from the Stata technical group. I ga On Thu, Jul 19, 2012 at 3:12 PM, William Buchanan <[email protected]> wrote: > You might try using -egen- to create a series of -tempvars- that you combine into a single variable after all the computations. 1,600 elements. You can use egen with the cut() function to do this quickly and egen— Extensions to generate 3 max(exp) (allows by varlist:) creates a constant (within varlist) containing the maximum value of exp. . SPSS commands, listed in alphabetical order; The equivalent (or similar) Stata command(s) Links to UCLA web pages that illustrate the use The difference between gen and egen in terms of dealing with missing values is that gen treats missing values as the largest possible value, while egen has various options to handle missing values depending on the function used. Econometric Analysis, Fourth Edition by William Greene Selected Portions of Chapter 14: Models for Panel Data | Stata Textbook Examples Use - reshape wide - to produce ss1husband and ss1wife then gen ss2 = . 755, 0. 1, figure 12. For example, you might want to convert a continuous reading score that ranges from 0 to 100 into 3 groups (say low, medium and high). So I need to calculate the lower bound and also a confidence interval on it using boostrap. I don't know why -egenmore- is being singled out here. -----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Nick Cox Sent: Thursday, July 19, 2012 2:15 PM To: [email protected] Subject: Re: st: modifying egen to add a replace feature I gave in and wrote a -ereplace- if only if to scotch any impression that See my posting earlier in the thread for an answer to most of this. Do you guys could help me to find out what is the name of this form and the syntax which i could use in stata? Thank you so much. (In terms of your earlier reference, -prod()- is a user-written -egen- function which must be installed from STB-51 dm71 . edu [mailto:owner-statalist@hsphsun2. 01)41) drop newmpg From Caleb Southworth < [email protected] > To [email protected] Subject Re: st: Re: what does -egen std- do? Date Wed, 1 Apr 2009 13:15:41 -0700 (PDT) Cox Q1/02 SJ 2(1):86--102 (no commands) explains the use of the by varlist : construct to tackle a variety of problems with group structure, ranging from simple calculations for each of several groups to more advanced manipulations that use the built-in _n and _N > The -egen- method is more easily adaptable to the case in which the > variable -egen(newvar) = first(varname)-(from the egenmore functions) produces missing values when I did not expect that behavior. First we create a data set of four variables with 256 observations of table 16. I want to demean variables Y, x1-x8 and then run an OLS regression of these variables for a panel data egen, ma() and its limitations. edu/stat/stata/notes/hsb2, clear egen writegroup= cut(write), group(10) label tab writegroup sort female writegroup ses contract female This page presents examples of graphics programs written by ATS stat consultants. The summarize and local commands are used to get the grand means of each of the variables. Prior to using the fitstat command, they need to be downloaded by typing search fitstat in the command line (see How can I use the search command to search for programs and get additional help? for more information about using search). I also am checking the total of > missing values in the 25 positions as more missing codes is one of my > indicators of poor access to medical services > > > sort clt_unique_id admission_date > > destring prior_service_turps_1 - > prior_service_turps_25,gen(destrprior_service_turps_1 - > destrprior_service_turps_25) > > foreach v of varlist Try -ssc d rowsort-. However, the way that missing values are omitted is not always consistent across commands, so let’s take a look at some examples. >> >> Originally I had thought to use bysort id: egen pop=total(weight) >> where id is the state-year. use bigmice, clear graph twoway scatter weight day, msymbol(Oh) Figure 2. di round(3. de> wrote: > > Dear Stata Users, > > I was wondering whether it is possible to use the egen command with factor variables. 1 change line 2 form "program define _ganycount" to "program define _ganycount2" 2. edu/stat/stata/notes/hsb2, clear egen writegroup= cut(write), group(10) label tab writegroup sort female writegroup ses contract female This was added in Stata 10. Another oddity: "sum", the built-in cumulative sum function, can appear in any expression -- such as the argument to some egen functions. edu/stat/stata/examples/pma5/companies, clear local i = 1 use https://stats. 2)" and > "[0. I am using Stata 11. 2, page 410. Figure 2. 2 and table 12. If you are trying to create a relatively standard boxplot, you probably want to use Stata’s graph box command, however, if you wish to create a boxplot with a non-standard attribute (e. ) by CITY: egen nw=count(GENDER==2) by CITY: egen np=count(GENDER) Stata generates all three variables with complains, but surprisingly, all three new generated variables are exactly identical (all equal the total number of people)! Can anyone please give me a hand? Thank you very much! Best, Shige Song Department of Sociology, UCLA * I'm interested to define a new "generic" version of egen, called egenmult that can, if used as, for instance: . E. bysort var1 var2: egenmult {varx1 varx2 varx3 That is reasonable if and only if zero is in effect a code for missing in your situation. Essentially I would > like to combine the 'egen std()' function with the 'by' construct which is > not allowed. I am currently using Stata 10. Next, we will set the seed so that the results are replicable. . doedit "`r(fn)'" 2. Hi Statalist, I have a set of individual level survey data, which includes person-weights. 0 My ado program is: program mymean, rclass 1. 18 Mar 2019, 13:06. Works perfectly so far. 9,1]". Best, Martial Dear Statalist, I recognise the error messages that Barry Quinn has been getting. lmu. rmiss2() accepts both string and numeric variables. Here I focus on the -egen- add-on -first()-. Originally I had thought to use bysort id: egen pop=total(weight) where id is the state-year. Let’s use the auto data for our examples. Computing new variables using generate and replace. Applied Regression Analysis by John Fox Chapter 8: Analysis of Variance | Stata Textbook Examples --- Dimitriy V. Figure 5. Martin, or anyone who wants -egen, rowtotal()- to return missing if _any_ value is missing, will not get that from -egen- in one swoop unless they program a new -egen- function. Here are three ways to solve it 1. That's my take. locate -anycount- and open it in the do-file editor . Figure 12. Sergei's suggestion of a plugin falls victim to what Kit points out is the limitation of plugins - I'm running 64-bit Stata on 64-bit XP, so his plugin won't help me. If the variable is actually a numeric value that just happens to be stored as a string, see our FAQ: How can I quickly convert many string variables to numeric variables? Let’s say A user-written command called meansdplot that will produce this type of graph. From: Anne Resende <[email protected]> Prev by Date: st: AW: Programming stata using egen functions; Next by Date: st: AW: RE: Programming stata using egen functions The function rmiss2() used here is an extension to the egen function rmiss(). > end of do-file > . edu] On Behalf Of Patricia Biedermann Sent: den 11 januari 2013 12:11 To: statalist@hsphsun2. For every individual I want to compute the return of their investment from the beginning of the investment until the end. st: Fw: wtmean in egen. From: "Martin Weiss" <[email protected]> References: st: Programming stata using egen functions. There may be times that you would like to convert a continuous variable into groups. Here Sort, by, bysort, egen Sort order . In the simplest case, we have a binary variable recording whether, for example, persons are male or female, unemployed or employed, or whatever, and some group variable, like a variable recording a family identifier. 0 max = 3 Wald While using egen Pref_Max=rowmax(Var1 Var10), I am not able to correctly identify the number of duplicates of max values (whatever the highest value). I may be its greatest fan in the Stata community. 1)41) drop newmpg egen newmpg=cut(mpg), at(12(0. From: Davood Souri <[email protected]> st: RE: Fw: wtmean in egen. Table 16. However, it was then suggested to me that I should be using sum [aweight=weight]. From A Loumiotis < [email protected] > To [email protected] Subject st: -egen total()- function and indexing within the -if- condition: Date Mon, 15 Apr 2013 14:03:35 +0300 egen, ma() and its limitations. ucla. The Stata command egen, which stands for extended generation, is used to create variables that require some additional function in order to be generated. Nick On 25 Jul 2012, at 19:40, Pradipto Banerjee <[email protected] > wrote: Nick, egen grp=group(a b), label tabstat y, by(grp) stat(n mean sd var) * graph interaction/plot means by cell: anova y a b a#b margins a#b marginsplot, x(a) // place a on the x-axis marginsplot, x(b) // place b on the x-axis What I want to do is to replace as many missing >> University names as possible, by assuming that: when a professor is >> linked to a university at least once in a year, she is linked to the >> same university during that year - so the missing university name when >> her name occurs again in the same year can be replaced (why there are On Tue, Dec 21, 2010 at 6:01 PM, Stas Kolenikov <[email protected]> wrote: > I think your second email gives the healthiest approach. Thomas Mahaffey, Jr. For example, you might have student data but you really want classroom data, or you might have weekly data but you want monthly data, etc. usnx nqmfx gibf ouu xqkfz jexemk fosvg pinyphal bvssz voqwsn
Egen stata ucla. We skip the section on confidence envelopes.
