Stata collapse

Stata collapse. The community-contributed gtools suite can help a lot with speedups and, fortunately, has a faster version of collapse, called gcollapse. com graph twoway line — Twoway line plots+ +This command includes features that are part ofStataNow. Re: st: -collapse- and variable names. 첨부파일. Thus the syntax for line is. Collapsing your data means to combine several cases into single lines. This module illustrates the power (and simplicity) of Stata in its ability to reshape data files. Feb 24, 2012 · Is there an extension to -collapse- that counts the number of distinct observations for a variable? For example, say I have a dataset of individuals, each of whom is assigned to a group. OP contacted me off-list to say: On Mon, Nov 26, 2012 at 7:16 PM, Tomáš Houška <[email protected]> wrote: > Dear Mr. or anywhere else in Stata, an individual value of a variable. My dataset is 2. I have a data set with approx. #데이터관리. I need to calculate sum of BuyTradingValue and SellTradingValue within IssueName and by a certain InvestorCode (I need to sum Buy/Sell of the following investors RE: st: Collapse & Missing Values. Several observations that have Stata Paulo Guimaraes Motivation Storing and Accessing Data Manipulating Data Data Analysis References Reading data Stata reads faster from its native format Stata reads all data to RAM and there are limits on the number of observations and number of variables. gen weight = runiformint(0,1) sum x [aweight = weight] collapse (mean) x [aweight = weight] We would like to show you a description here but the site won’t allow us. st: collapse (sum) versus egen (sum) Date. com collapse takes the dataset in memory and creates a new dataset containing summary statistics of the original data. Note that we won’t necessarily see a benefit for small(ish) datasets like the one Subject. collapse adds meaningful variable labels to the variables in this new dataset. ) into a dataset or matrices. Stata handles restoring the user’s data, even if the user presses Break in the middle of the program. Instead, you have to use first, last, firstnm, or lastnm. You are also asked to use your real full name when registering with Statalist. Sep 27, 2013 · Thinking on this some more, my egen count with by operation isn't necessary. These show common examples of reshaping data but do not exhaustively demonstrate the different kinds of data reshaping that you Title. Is there a way to collapse the data and tell Stata to automatically rename the collapsed variables? Perhaps this is too specific and not too many people would need that In that case, is there a way to rename a bunch of variables Feb 19, 2003 · 이 collapse란 명령어를 지난번에 <[Stata] reshape 명령어 응용2 - 그룹 및 시간별 평균 구하기> 블로그 글을 통하여 소개한 바 있다. [to simplify the dataset] (15 observations deleted) . 23 May 2017, 22:24. -statsby- statsby "corr var1 var2" corr = r (rho) , by (group) is a good solution if only one correlation is of interest, but not, I think, for many. Hills and T. -collapse- cannot calculate a statistic like mean or sd of a string. Brady), which tackle most or all of the wrinkles mentioned here. > > Lets say you have variables "quantity" and "price", each one has two Nov 16, 2022 · Logic of summarize’s formula. I take the issue to be how, when asked to treat _cumulative_ sums with -sum ()-, Stata regards missing values. J. This worksheet walks you through using the commands binscatter, collapse, and twoway. set obs 10. Nov 16, 2022 · Data on multiple responses in this structure can be used immediately for many analyses. Commands in the video: . For example if a variable is named "age" with the label "age of subject", after using. then, I am going to use "IQR2_x" in my model and interpret as 'the change in the outcome var per one IQR change in the predictor (X). Cox), and unique (M. Ronna Cong, StataCorp. com svy estimation — Estimation commands for survey data DescriptionMenuRemarks and examplesReferencesAlso see Description Survey data analysis in Stata is essentially the same as standard data analysis. All credit goes to Nick Cox. 2. For the case mui = mu, the variance of xbar = (sum wi xi)/ (sum wi) is sigma2/W. First we load the dataset, with use. The generalisation is. My contribution is modest, but I send it to Statalist for the record. Jan 20, 2021 · collapse命令可以将变量数据转换为均值、和、中位数等等，可以按某变量分类计算统计量的值。本文介绍了collapse命令的语法、选项和例子，包括如何使用权重、删除缺失值等。 The collapse command in Stata is used to aggregate a dataset by collapsing it based on some summary statistics of a variable like mean, sum, median, percentile, standard error, etc. In panel 2, the individual is in state 1 only from time 3 to time 5. bysort <variables defining groups> (<variable defining order first last>): keep if _n == _N. Checking with egen oplantal=sum (aantal),by (opl114) though gave exactly Title stata. asdatenum tells putexcel that the speciﬁed exp is a Stata %td-formatted date that should be converted Next by Date: st: 1st Australian and New Zealand Stata Users Group meeting Previous by thread: st: Collapsing and renaming variables Next by thread: st: RE: Collapsing and renaming variables Collapsing Data - Simon Ejdemyr st: Collapse - How does it collapse. Reading in In a corresponding Stata data set the first column is the variable -id-, the second is the variable -occ-, the third -ocx- and the fourth -day-I want to obtain a matrix like that: 1 2 1 28 2 1 1 26 In the standard Stata language this is easy:. The collapse command has the following syntax: where stat is the statistic you want to calculate, such as mean, sum, median, etc. 댓글 0. The objective is to create a mean value for each hour, multiply by a population count, and then sum to different category levels. Oct 5, 2014 · Well, it depends on your use of -collapse-. com/course/getting-star Jul 5, 2017 · 데이터를 잘 보면, 각 더미 변수 값의 합이 각 가정의 여자/남자 아이 수가 된다는 것을 발견할 수 있다. Try foreach creating a new set of variables with the same values as the old variables. Stata has a great collection of date conversion functions for this type of tasks. All specifications of Eq. Nick [email protected] Eric G. ; newvar is the name of the new In the code below we do three things. st: Collapse in Gmm. The commands are. After the command we have (mean), which tells Stata that we want to save the means, and we do it for the variable wdi_empagr (the percentage of the population employed in agriculture). See examples of how to compute means, counts, and totals for different variables by group. Thu, 19 Aug 2004 09:38:42 +0200. The data is a series of individual hourly regression estimates (hr1-h24) as well as a few other variables. In this short video, I cover how to take a variable on a larger scale and collapse it to substantially the same variable on a smaller scale through the use m Sep 12, 2019 · Stata command collapse can create a new data set that contains the summary statistics of the original variables. gen wtmedian = . For example, variable names might be too long to allow a simple prefix or suffix. fweight, iweight, pweight: sum (w_j*x_j); w_j = user supplied weights. Example 2 Now let’s consider a program that must destroy the user’s data but needs the data back again, and, once the data are recovered, will do no more damage. Nov 16, 2022 · You need another solution. This is a trickier problem that might first appear. We will issue command " help dcfcns " to display these available Mar 2, 2018 · Nick's answer is better than mine, and good practice when string data isn't behaving as expected. Aug 23, 2022 · An observation for Stata. I am using four study models for each explanatory variable and the results obtained for the first model are presented below: Data Wrangling. Stata's command names are syntax highlighted and now you can define your own keywords such as user-written commands to syntax highlight in their own color and font style. Whatever way of shortening the name is used, there is still a need to maintain distinct asdatetime tells putexcel that the speciﬁed exp is a Stata %tc-formatted datetime that should be converted to an Excel datetime with m/d/yyyy h:mm Excel datetime format. The reason is that -statsby- includes a built-in collapsing of the data set, so you would need to read in the original data set repeatedly to do it repeatedly. I have continuous predictor variable (x) and create this in stata: egen IQR1_x=iqr (x) gen IQR2_x=x/IQR1_x. gen constant = 1. The computation then proceeds as if two integers had been speciﬁed. #스타타. If you read -help sum ()- you will see that. st: RE: Collapse w. mean calculation? I suppose I could do this in two collapse steps, but. Page of 1. I'm using the Collapse command in Stata to aggregate a series of numbers by different categories. collapse with if works this way: Those observations selected by the if condition are collapse d, typically (but not necessarily) into a new dataset with fewer observations. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Stata Learning Module Reshaping data long to wide. These examples take long data files and reshape them into wide form. This le May 23, 2017 · Posts: 28624. While aggregating a dataset using collapse some strange results were obtained: collapse (sum) aantal, by (opl114) Did not give the same results as the same dataset gave in other programs. For a concrete example I assume panel data with identifier id and time variable time: bysort id (time): keep if _n == _N. Now there was a logic behind the use of summarize ’s formula for aweight s: s 2 = {n/[W(n - 1)]} sum w i (x i - xbar) 2. I am especially unfamiliar with the use of the "= _n == _N" syntax To. collapse. (1978 Automobile Data) Collapsing. Then we have the important command collapse. This option has no effect if an exp is not speciﬁed as the output type. While using a labeled Index or MultiIndex can enable sophisticated analyses and is ultimately an Incidentally, 1. 5 hours content): available on Udemy: https://www. At the end we included one example using function collap() from new package "collapse". Hoy en nuestro blog daremos un breve recorrido por las opciones que tiene Stata para que podamos colapsar bases de datos a través del comando collapse, pues a veces resulta de mayor utilidad las estadísticas descriptivas de nuestras variables, así como sus características y con este comando podremos obtener una nueva base de datos a partir de estas. com merge — Merge datasets DescriptionQuick startMenuSyntax OptionsRemarks and examplesReferencesAlso see Description merge joins corresponding observations from the dataset currently in memory (called the master dataset) with those from ﬁlename. Normally, it should matter little if the new dataset contains fewer variables than the original dataset. 그렇담, 아래와 같이 collapse (sum) 명령어를 사용해주면 끝! . > stata. The collapse (percent) command is supposed to yield the percentage of nonmissing observations. Cox), the egen function nvals() (N. DescriptionQuick startMenuSyntax OptionsRemarks and examplesReferenceAlso see Description line draws line plots. This module illustrates the power and simplicity of Stata in its ability to reshape data files. Example using collapse : . , per one IQR. These limits depend on your version of Stata if you have trouble importing a large Here is a counter-example using the auto. With big datasets, Stata can be slow compared to other languages, though they do seem to be trying to change that a bit. sysuse nlsw88. Data Wrangling in Stata. > instruments is abnormally high. 5 and a total weight of 197 is assigned to higher values, . In 1997, for example, as a total weight of 200 is assigned to . In pandas, if no index is specified, an integer index is also used by default (first row = 0, second row = 1, and so on). Which I assume Stata is not understanding that my global `variables' is a varilist. This data management step can also be done in R using the summaryBy() command in the "doBy" package. label var `v' `"`l`v''"'. You can use ds to create a list of variable names. An observation is not here. . The following code will come in handy for this tutorial:set obs 144000set seed 1 STATA: Binscatter and Collapse. Is there a collapse-like command where I apply the weight only to the. count if q1 == 5. If you are familiar with egen, you can think of collapse as equivalent to egen, except than rather making a new Jul 7, 2021 · 4. Of course, you would then need to drop data based on small samples after the -collapse-. you will recall, is in other terminology an entire case, record or row in the dataset. . All good advice, and here is some more: 1. Collapse code within program, mata, input, forvalues, quietly, if/else, and other blocks of code. Apr 16, 2016 · You need another solution. collapse converts the data in memory into a dataset of means, medians, etc. > which you can limit instrument proliferation. If you specify uniqusing in your example, it should not change the behavior Subject. st: RE: String Variable in Collapse Command. Wed, 21 May 2008 12:17:44 +0100. Aug 12, 2022 · This video discussed how to collapse or aggreate data on a group variable i. Data wrangling is a critical skill for quantitative research. Wed, 28 Sep 2005 21:53:49 +0100. If you specify a merge matched on a variable with missing values, you expect the missing values to be matched. I echo Michael in noting that -collapse- can produce a count variable, so that there is no need to set up your own. Several observations that have In practice, you only need to remember to "squeeze" -collapse between "include copylabels" and "include attachlabels". “Data Wrangling” is the process of preparing data for analysis, which includes importing, cleaning, recoding, restructuring, combining, and anything else that needs to be done before it can be analyzed. collapse (mean) age, by (id) the variable age gets a new name " (mean) age" and a label " (mean) age". replace mpg = . It is important to learn these commands because they are very useful for describing data, specifically regression discontinuity. Let’s consider the dataset hsb2. Dear All, I am using -xtabond2- to run GMM-estimation. Nov 15, 2018 · First you have to create the binning variable itself. In cases like these, I always create a small dummy dataset with easy to calculate values and test whether I get the result I want. These examples take wide data files and reshape them into long form. Wruck > I have mutual fund data on 1. Suppose that you want weighted medians. 3. replace w=pop/w; collapse (sum) pop (mean) avgwage [w=w]; I would like to see 70, not 90. These show common examples of reshaping data, but do not exhaustively demonstrate the different kinds of data reshaping that you could encounter. Let’s start with binscatter. Sometimes you may want to collapse a dataset into frequency form. use c:\stata\auto,replace (1978 Automobile Data) . Introduction and Review. In panel 1, state 1 first occurs at time 4, and the individual remains in that state. Binscatter is a command created by Michael Stepner and Jessica Laird. y x1 x2 x3 i. Below is the code I used xi:xtabond2 y L. Each individual also has a job title, which is stored as a categorical. There are 6 variables: IssueCode, IssueName, InvestorCode (defines type of investor), BuyTradingValue, SellTradingValue, date. I agree with Svend, but Martin's is a understandable wish. dta, For examples of this in Stata, see our Stata Learning Module on collapse. Learn how to use the collapse command to summarize data across observations in Stata. An example solution. The xtabond2 command has a "collapse" option, in. An extra space in the middle of a string is easy to spot; at the ends of a string, less so, and leading to mystifying results like yours, and tabulations that seem to show the same string value more than once. Stata will list the names of all the existing she forgets the problem. variable. This can be estimated by u2/W, where u2 is the estimate of sigma2 we had before. , not zero. preserved datasets. Philipp Rehm < [email protected] >: This seems to be the desirable outcome. how to sum variable for group in stata, how to find mean of varaible for a gro In Stata, a data set’s rows are essentially unlabeled, other than an implicit integer index that can be accessed with _n. count if q1 == "Stata". Because the syntax diagram for collapse makes using it appear more complicated than it is, Nov 19, 2018 · 1. If amt is set to 0b We would like to show you a description here but the site won’t allow us. 5 emerges as the median. Then I use: collapse (sum) count Sep 30, 2020 · The function -sum ()- creates a running sum, not a grand total. Sep 12, 2022 · CONTROL (C): debt_rat, curr_rat, firm_size, wcreq, grwce. Without even looking at the code, I guess this is how -collapse- is doing its Here the variable state takes on two values, 0 and 1. (그리고 콜랩스 명령어의 syntax와 사용예시가 자세하게 소개되어 있으니 collapse 명령어를 처음 접한 분은 저 링크를 참고하길 바란다 Remarks and examples stata. com contract takes the dataset in memory and creates a new dataset containing all combinations of varlist that exist in the data and a new variable that contains the frequency of each combination. Stata/SE and Stata/BE are typically used on computers with less memory and as such always preserve datasets on disk. xtdpdsys is an officially command of. udemy. However, it doesn't seem to: Code: sysuse auto. Thank you Phil, this works! I had glanced at the -bysort- command beforehand, but hadn't figured to do it this way. Posts; Latest Activity; Search. year) twostep robust small However, I also tried xi:xtabond2 y L. The outline is program myprog This video demonstrates how to recode, reorder, and/or collapse response categories in Stata. This is much liking creating statistics for groups of cases, but by collapsing your data a new data set is created that contains these statistics and can be put to further use. #2. Since I keep using the. Please show a sample of the original data, using the -dataex- command, and the exact code you used to collapse the data, and your -xtset- command if you have used one. This relabeling must be done in the same session as the collapse, as local macros do not survive beyond the end of a session. Is it possible to keep the label when we use -collapse-? Oct 14, 2015 · Without seeing the structure of your data, it is hard to say but it sounds to me like you wouldn't even need to issue both sets of collapse commands since your data will be collapsed by the same variables each time and you are calculating the same statistics for Complete and all_m. Whether it would be an aweight or an fweight depends on exactly how you -collapsed- your data. The application is helpful in collapsing stock data across mutual funds or products across firms. Nikhi wrote: > Is there a way to get all (_all) except for one of the variables? To my mind come two easy solutions: - to use "if" and loop through the levels of your categorical variable: ***** sysuse auto, clear drop make forvalues i = 0/1 { preserve collapse _all if foreign == `i' save c:\temp\collapse`i', replace if `i' == 1 { append using c:\temp\collapse0. Time. Wruck > I have mutual fund data on Nov 16, 2022 · Stata users have written various programs in this area, including distinct (G. do. Depending on the collapse, it can be up to twice as fast than gcollapse ; however, it remained slower for some use cases. Sat, 3 Nov 2007 12:18:59 -0400. We need to be able to deal with both patterns, recognizing that the state concerned may be absorbing or just temporary. There is also a command -egen, cut Mar 15, 2022 · Collapse. Focus on the code you Stata 17+, MP version, introduced significant speed improvements to the native collapse command, specially with many cores. Oct 6, 2014 · The easiest generic way to keep the last of a group is as follows. Then we have another command, (median Remarks and examples stata. st: Collapsing and renaming variables. Feb 27, 2023 · This video shows you how to collapse data in Stata. Creating the binning variable can be done in a number of ways. Aug 29, 2023 · Creating and saving bootstrap samples for. Nov 16, 2022 · Syntax highlight user-defined keywords. To get the grand total in each observation of the group, you need to use -egen-, not -gen-, and the function is -total ()- not -sum ()-: Hi, thank you for pointing out the commands that solve my problem. Roodman (2006) offered an user-written version for a system GMM. The standard syntax applies; you just need to also remember the following: Use svyset to identify the survey design characteristics. That is one reason you are asked to post a minimal example with code. You can use collapse when you want to create summary statistics of your data, or some of your variables. However, the number of. foreach v of var * {. RE: st: Short program to "collapse (# unique elements)": Use of nested loops and a "weights not allowed" message. Once the limit has been reached, Stata/MP falls back to writing preserved datasets to disk. < [email protected] >. contract and keep also work in this way After collapse, you can then just use the old labels: . #Stata. Hello, I wanted to interpret my result by interquartile range (IQR), e. Code folding. For example, you might want to know how many respondents use Stata. I have an estimation procedure which requires bootstrapped standard errors. Nov 29, 2015 · Collapse with condition. Re: st: -collapse- and -merge-. Note that collapse works by replacing your data with the summary statistics of each variable that you request. dta save c:\temp\collapse01 Nov 16, 2022 · Datasets in memory are stored in frames, and frames are named. You can create frames, and delete them, and rename them. What am I Title stata. Fortunately, Stata develops labels for each variable providing details on which statistic occurred from a collapse. use auto, clear. count if missing(rep78) count. drop if rep78 <3 | rep78==. Weights. But your command is exactly > what i have tried and what fails to accomplish my goal. Those observations not selected disappear. e. Author. This is really a feature, although I may have to work hard to convince you of that. problematic otherwise). Jul 25, 2022 · Collapse. Somehow you need to tell Stata which variables you want to sum by health center, but that doesn't mean that you need to type them all. Using missing values as initial values is arbitrary. Please follow advice given at the footer of this post. It would definitely not be a -pweight-. > estimation (xtabond2). (which is fine if the string variable is constant within the group and. The most direct is just with a series of -generate- and -replace- commands conditioned on the binning variable falling in between two cutpoints. Like this: Oct 3, 2022 · 【Online Courses】⚡Getting Started with Stata: (24 lectures + 4 assignments = 5. It's incorrect to say that this command is unusual, let alone unique, in that respect. For this, we first initialize a variable: . If q1 is a string variable, type. Mar 20, 2015 · As you know, -collapse- does not preserve the label of variables that it operates on. Nicholson, > > thank you for your help on Stata collapse. Using multiple statistical outcomes from one collapse can make keeping track of statistic output somewhat difficult by looking at the variable name alone. gen x = _n. We will show an example on how to collapse our daily time series to a monthly time series by making use of a function of this kind. Filter. 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. If you use the option not then ds will list all but the variable names you are mentioning. Then you can -collapse- -by ()- that variable. RE: st: St: collapse by _N. graph twoway line Remarks and examples stata. I have a dataset in Stata and want to count by group ( loc_ID) and year. Date. Their name starts with the same prefix: varname_string1, varname_string2 varname_string50. dta (called the using dataset), matching on one or more key RE: st: collapse prob. By default, the mean of one (or several) variables is created. line is a command and a plottype as deﬁned in[G-2] graph twoway. This includes a demonstration on how to create a dummy variable We would like to show you a description here but the site won’t allow us. Tue, 24 Feb 2004 15:58:34 -0500. 7M observations, ~3500 clusters, and the estimation procedure takes a long time per sample (the supercomputer takes roughly 15hr to bootstrap 20 replications using Stata's bootstrap). If option bonett is speciﬁed, you must additionally specify # kurtosis with cii variances. if foreign ==0 & rep78 ==5 [to setup Title stata. My dataset is in panel form. Wed, 20 Oct 2010 11:31:31 +0100. 첨부파일 collapsing data across . Subject. (1) are estimated with the GMM estimator system, using the Stata command xtabond2. dta dataset, showing that, when the variable of interest (mpg) is missing in a cell, collapse returns sd = . Stata interprets it as the fraction of successes or events and converts it to an integer number representing the number of successes or events. I can generate a 1/0 variable for nonmissing/missing string variables then use (sum) in collapse. or if q1 is a numeric variable in which Stata is represented by 5, type. g. The default setting for set max preservemem is 1g, meaning 1 gigabyte. Wed, 5 Aug 2009 09:54:28 +0100. From: Nick Cox <[email protected]> Prev by Date: Re: st: dynamic panel - bootstrapped Sargan and exclusion tests; Next by Date: st: How to determine bandwidth in ivreg2? Previous by thread: Re: st: Collapse - How does it collapse Dec 22, 2017 · Learn how to collapse observations to generate means and standard deviations. I used the following two lines of code: egen count_obsv = tag(loc_ID year) This adds a counter to my dataset ( count_obsv) which is 1 (and 0 for every element that has the same combination of loc_ID and year) for every new combination. industry i. collapse (sum) occ ocx (max) day, by(id) I wonder how the same result can be obtained in mata? Apr 20, 2021 · 20 Apr 2021, 20:36. Longton and N. Code: clear. Feb 28, 2020 · 21 Sep 2020, 02:02. Tue, 30 Sep 2003 01:16:32 -0500. One way to get them is to loop over the distinct values of group, calculating the medians one by one. Saving stats (means, standard deviations, etc. I don't know why you thought otherwise, but the weights are applied to the medians too. Thanks. From: Dawood Ashraf <[email protected]> Re: st: Collapse - How does it collapse. It is helpful to know these functions before we start our task. Thu, 9 Jan 2014 16:24:04 -0500. year Nov 16, 2022 · After collapse, you can then just use the old labels: . I would like to get the count and mean with a collapse. Compare these results using groups from the Stata Journal, although there are plenty of other ways to do it. 10 Aug 2017, 03:20. 50 variables. Many Stata commands support the in Subject. year, gmmstyle (y x1 x2 x3, lag (3 5) collapse) ivstyle (i. So, let's say I wanted to -collapse- this dataset into a dataset of groups. that seems clunky. You can rename it. no mf dg yj wn gv qm nw co ej