Stata generate count variable by group. I would like to create two variables.

Stata generate count variable by group Nov 7, 2022 · This will give a unique number to all observations that have the same combination of cluster, household, and respondent line numbers. Jan 19, 2018 · Hello, I have a number of variables. There is an interesting underlying issue here, what exactly is "programming" in Stata? A precise answer is that a program is whatever is defined by whatever follows a -program- statement. Ryan's code can be telescoped to egen sum_var = sum (X), by (group) egen count_var = count (X), by (group) gen mean_X = (sum_var - X) / (count_var - 1) You could do without -egen Jan 15, 2019 · This variable would most likely count the number of "NP"s in all 14 variable for a given id-year, and subtract that from 14 (because 14 is the maximum number of services provided, subtracting the number of those not provided would give me what I need). three Aug 15, 2014 · Hello, I've been looking for the command to create the variable in yellow, using "bysort folio2 ls04: gen mujeres=_N" I created "count" but I don't know how to create variable "mujeres por hogar", can you help me please? Nov 16, 2022 · How do I create variables summarizing for each individual properties of the other members of a group? Jun 19, 2019 · 2. Nov 16, 2022 · The variable nvals now contains the number of distinct observations. trueI thought the answer to this would be easily searchable but I can't quite find what I want. Creating a variable equal to the count of unique values across varlist for each observation I have data with a bunch of different date fields that may or may not contain the same information. In Stata you can create new variables with generate and you can modify the values of an existing variable with replace and with recode. We wish to calculate BMI, which is defined as weight in kilograms divided by the square of height measured in meters. To do this, you use the by prefix command. , job_code). I use STATA 14. To illustrate, let’s use stocks. Using egen difficult and tedious variables can be created easily. The good news is that this can be done without ever Aug 3, 2015 · I agree with this solution, except for the rowtotal piece. Using the nlsw88 training Description cluster generate creates summary or grouping variables from a hierarchical cluster analysis; the result depends on the function. Jun 15, 2015 · I am trying to get summary statistics for my data by group. In your case the natural question arises whether for example the pair (1, 2) is really the same as (2, 1) and for May 29, 2018 · It is not a good idea in Stata to create a variable that is 1 when some logical condition is true but missing value when false. It is easy enough to generate these as two separate tables with estpost, summarize, and ttest, and combine manually, but I would like to automate the whole process. This portfolio contains 32 Aug 7, 2017 · Dear all, I have created a local varlist that contains several variables. The percent () option was added to contract to Stata 8 on 1 July 2004. com count may strike you as an almost useless command, but it can be one of Stata’s handiest. Although we chose to tag the first observation in each group, as was specified by _n == 1, we could have done it also for the last observation in each group, for which the code is _n == _N. Jan 20, 2016 · I used the following function to create the median of a variable called “GAI” in my sample: egen median_GAI = median (GAI), by (fyear) Now, I need to create a dummy variable that says: if the GAI of a CEO in year x, is higher than the median_GAI variable for that CEO in that specific year, then = 1, and this 1, should be labeled as Generalist. " In a Stata data set all of the variables (columns) are necessarily of the same length. Like generate, it is used to create new variables, but it is much more than that. You can do anything with replace that you can do with generate. 7. generate and replace This chapter shows the basics of creating and modifying variables in Stata. Thank you! See full list on stats. Sep 23, 2020 · If V1=10, I want to count how many responses from V2 are 3 and make that as a new variable. 1 Generate and Replace The primary commands for creating and changing variables are generate (usually abbreviated gen) and replace (which, like other commands that can destroy information, has no abbreviation). Aug 13, 2014 · The second problem is that you created the variable asset_group to be a numerical variable; now, if you are trying to replace its contents with a string instead of a number, Stata will tell you the variable type does not match. I have data that contains school-level observations. A set of new variables may be created if a range of group sizes is specified. Any thoughts or perhaps something I need to clarify further? Thank you! How do I create a variable recording whether any members of a group (or all members of a group) possess some characteristic? Remarks and examples stata. Explore techniques. S. Instead, I'd use one step (and not create unnecessary variables) with total(fee1 + fee2) Mar 1, 2020 · Creating unique group ID variable 01 Mar 2020, 11:47 Dear all I have a hopefully trivial question that I can't get my head around right now. For instance, for entity 1, year 2010 I would have 2 (The aim is to avoid double counting!). Do you know how can I count the variables inside it and save the number in a scalar? Nov 16, 2022 · illustrates the main possibilities. From: "Nick Cox" < [email protected]> From: "Nick Cox" < [email protected] > Prev by Date: st: assign values of a variable to a macro Next by Date: Re: st: assign values of a variable to a macro Previous by thread: st: assign values of a variable to a macro Next by thread: st: RE: RE: Creating id number by subgroup Index (es): Date Thread Date Nov 16, 2022 · Bar charts are a popular tool used to visualize the frequency or percentage of observations in each group of a categorical variable. We have a variable, say "type", and want to built a new variable, say "typ_freq", which shows the relatively frequency of each value of "type". It is much better to create a 1/0 variable. The functions are specifically written for egen, as documented below or as written by users. Having flagged the nth observation in each group, you can May 18, 2011 · However some of my observations (group_id = 2 in my small example) have the same values of ranking variable and this approach doesn't work. or "") are to be treated like any other value when assigning groups egen One of Stata’s most powerful and useful commands is egen. I'll leave the solution in the comments. 3 for everyone that is a farmer in that district. SOLVED!! Thanks for being here. How can I do this? Dec 12, 2013 · In my dataset, I have observations for football matches. The resulting dataset includes new variables containing frequencies and percentages (the latter of the data as a whole) as well as cross combinations of the variables specified that have zero frequencies. We simply divide height by 100 to 25. There may be times that you would like to convert a continuous variable into groups. Changing the composition of the group would allow easy re-estimation without having to change 10 equations. One that includes the count of all the 0 and one that has the Mar 11, 2021 · I need to generate the variable sum which cumulatively adds up the changes in TA_envi_tot across reporter-partner pairs and years. I want to generate a variable that is the count of unique dates for each row. Nov 16, 2022 · Sorted by: id The description tells us that the variable height is measured in centimeters (cm) and the variable weight is measured in kilograms (kg). I'd like to count the number of schools that are in the same district_id and serve at least one of the same grades. There is also a system variable _N, containing the number of observations in the dataset, or in the by-group if -by varlist:- is used. B. We'll look more at the egen command in another post. Thus far I have tried: bysort district: tab May 1, 2020 · I would like to generate a variable that counts the Person_ID's per Fiscal year. Jul 25, 2025 · Learn how to accurately count by group and collapse datasets using Stata. Jun 3, 2020 · I am using Stata version 15 to calculate the number of distinct cases (firm) by a group of two variables (entity and year). It describes data contents but also simply identifies unique values sysuse auto, clear codebook mpg, compact Number of unique values of mpg is 21. I'm trying to figure out how to count the number of instances of a value of a variable within a group. So instead of giving me e. Thank you in advance! P. I want to generate a variable that tells me how many ID´s each place has. It can be used as an identifier for a group defined by common values of those three underlying variables. edu When you call up the tag() function of the egen command, you assign the value 1 to just one of any number of observations with the same distinct values for the specified variables, and 0 to all the others. So I was thinking to, firstly, generate variable that counts how many observation per industry and year I have. This is an easy way to get see how many observations are in your dataset, but it can also count the number of observations based on a variable which groups observations. I have not been able to find any way of doing this in Stata, so I wanted to ask for advice. gen above_grp_means = 0 foreach x of varlist var1 var2 { bysort group: egen mean = mean(`x') replace above_grp_means = above_grp 26. I figured it has something to do with string variables, but I could not find a solution. Start with an all-zero counter variable, above_grp_means. I want to create a new variable that sorts the number of IDs by category. The following example loads up an automotive dataset included with Stata and counts the number of foreign and domestic cars in it. Nov 16, 2022 · I have a dataset containing a group variable, an individual identifier variable, and various descriptive variables. What I am looking for is to create a variable (or collapse data) that shows how many jobs they have throughout the year from 1994 to 1996. One of them is an ID and another one is Place. Then recode above_grp_means to a binary flag. Masterov" <dvmaster@gmail. The data structure is as follows: Question: I have a variable that I can tabulate to get the frequencies and percent and cumulative percent frequencies of its different values, but what I really want to see are the cumulative frequencies. Because Stata is an interactive system may not be combined with by. 0 for Mac Jul 11, 2024 · Data Analysis with Stata Cleaning a Stock Portfolio Stata has two system variables that always exist as long as data is loaded, _n and _N. You can use Stata's graph bar command to create simple bar charts, or you can add options to make more sophisticated charts. I understand how to have Stata produce the, for example, 90th percentile for a group of observations: bysort type period: egen p90 = pctile (rating), p (90) But how can I generate a variable that tells me the percentile for each observation? As in, the company's score for this 'type' and in this egen egen is the extended generate and requires a function to be specified to generate a new variable. The two primary commands used for this are generate for creating new variables. I am trying to generate two variables, "wanted1" and "wanted2", that by group_id generates counts for obs == 1 based on observations on the variables "obs" and "period" respectively. 10 different dependent variables explained by the same group of independent variables. Some examples are variables whose values are the mean of another variable for each group such as sociability for males and females. If the data are sorted, this can be restarted in each group. _N denotes the total number of rows. In particular, Stata 14 includes a new default random-number generator (RNG) called the Mersenne Twister (Matsumoto and Nishimura 1998), a new function that generates random integers, the ability to generate random numbers from an interval, and several new functions […] Mar 9, 2022 · What does "its row value is 1" mean? What is a "row value?" What do you mean by "The count column should be the same length as the time column. Your question is In a 10-observation dataset, _n takes on the values 1, 2, , 10. Apr 28, 2019 · Grouping observations in Stata April 28, 2019 Sometimes you need to split a variable into groups. N. We can also count missing values and use multiple conditions using " generate and replace generate and replace are used to create new variables and to modify the contents of existing vari-ables, respectively. by without the sort option requires that the data be sorted by varlist; see [D] sort. Jan 17, 2018 · I am trying to generate an enumeration variable for groups which are defined by other variables. You can use egen with the cut () function to do this quickly and easily, as illustrated below. tabulate, summarize() — One- and two-way tables of summary statistics In Stata terms, duplicates are observations with identical values, either on all variables if no varlist is specified or on a specified varlist; that is, 2 or more observations that are identical on all specified variables form a group of duplicates. Are there any other ways of doing this very simple task other than suggested by Nick and Fernando above? I am finding it pretty hard to follow Fernando´s suggestion applied to my variables (since I am pretty new to Stata), and I am using Stata: using egen group () to create unique identifiers Asked 11 years, 8 months ago Modified 8 years, 6 months ago Viewed 25k times Sep 30, 2020 · I use Stata 13. For example, ID 1 had 3 jobs, ID 2 had 1 and ID 3 had 3. Looking at Nov 16, 2022 · Stata 6: How do I create a variable that contains a repeating sequence of numbers? Oct 8, 2014 · Dear Statalist. For instance, if I had the following observations with school_id, district_id lowest_grade and highest_grade, then I'd like to create the last variable " count_same " Description count counts the number of observations that satisfy the specified conditions. The only differ-ence between the commands is that replace requires that the variable already exist, whereas generate requires that the variable be new. Commonly used functions include but are not limited to mean (), sd (), min (), max (), rowmean (), diff (), total (), std (), group () etc. varlist may contain numeric variables, string variables, or a combination of the two. The Stata command search would have led to these papers, except that the art to finding as well as searching is thinking of the right keywords. I am trying to generate a new variable that tells me the occupation shares by district; i. Loop through the two variables, calculating the group-specific mean, and adding 1 to above_grp_means if the value is above the mean. egen stands for extensions to generate and is used mainly for more advanced operations than can be handled with the gen command. Oct 31, 2013 · I'd like to create a new variable that takes a value of 1 for all observations in a group if, for any of the observations in the group, X is true. I want to sum up all values in the third column 'expgrp_total' by year and create a new variable Nov 29, 2021 · Hello everyone, I have one question related to counting distinct values by groups. I would like to produce a new dataset based on all possible pairs of identifiers within groups; that is, the observations in a pair must be from the same group. Discover the key functions like `egen` and `collapse` to harness the power of group May 23, 2022 · I'd like to create a new variable that counts the number of rows in which X == 1 sequentially within states, chronologically by year. com> Prev by Date: st: Stata procedure for RD density test Next by Date: Re: st: Program to simulate AR (1) time series and return Aug 16, 2015 · I have a dataset where each person (row) has values 0, 1 or . So, for example, the variable should contain the value 2 because the person ID is two times in the Fiscal_Year 2015. e. Creates a fifth new variable, the unemployment rate I actually want, by calculation from the raw numbers. Let’s use the hsb2 dataset as an example by randomly assigning 50 observations to each of four groups. And if the dataset is sorted by a variable -group-, and you type by group: gene wseqnum=_n then Stata will generate a new variable -wseqnum-, whose value is the sequential order of the observation within its group. It creates one variable taking on values 1, 2, : : : for the groups formed by varlist. 1 Continuous, categorical, and indicator variables Although to Stata a variable is a variable, it is helpful to distinguish among three conceptual types: Nov 5, 2018 · Furthermore, my attempts of using the count function and creating a loop doesn't work as the count function doesn't appear to work with variable lists and only with explicit variables. 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). g. . I would like to create two variables. The trick here is to create a random variable, sort the dataset by that random variable, and then assign the observations to the groups. Drops the variables used only for this process. I have three variables that I'm working with to create sex ratios: sex (1=male, 2=female) nativity (1=native, 0=foreign born) metarea (values assigned to each metarea) I would like to create sex ratios for the native and foreign born populations. Apr 16, 2016 · I want to calculate a variable containing weighted group summary statistics, but I do not want to collapse the data and egen does not support weights. The opposite problem: observations with the same values It should be clear that the opposite problem, finding observations with the same values, has an essentially similar solution. 1 and I couldn't get the results I want. In the example below I likewise try to generate X which is distinct for every B sorted by A. My data set is clustered and consists of neighborhoods, households, and household members: To create new variables (typically from other variables in your data set, plus some arithmetic or logical expressions), or to modify variables that already exist in your data set, Stata provides two versions of basically the same procedures: Command generate is used if a new variable is to be added to the data set, whereas replace, obviously enough, is used to replace an old (= already Oct 4, 2022 · I have calculated in Stata the percentage observations per group, year, and category in a new variable. (There is no circularity here, as program the English word and -program- the Stata command name are from metalanguage and language. I have read some threads on this matter and tried egen, count method that was recommended but did not succeed. three Nov 16, 2022 · How do I create a variable recording whether any members of a group (or all members of a group) possess some characteristic? Jun 12, 2014 · Dear all, My aim is to generate quintiles of a continuous variable (alcohol use/g; variable name: alc) by sex (variable: sex). In this article, we’ll explain how to create new variables in Stata using replace, generate, egen, and clonevar. I have been able to get counts of the male foreign borns by metro area using Nov 16, 2022 · Otherwise, generate a variable recording current order . Case 2. I already have an id variable, and I have multiple observations per id, but I want a new id variable containing 1 for the first id, 2 for the second, and so on. Then when you ask for the sum of those values in the same groups of observations, you get the group sums of one 1 and any number of 0s, and each sum is thus necessarily 1. The numbers are positive integers starting with 1. So, for example, my data has the obs, group, and flag variables, and I want to generate the variable grpflag. It has a minimum abbreviation of g. Now I want to get the average amount of observations per hometeam. We see how to summarize data for subgroups, how to generate new variables among subgroups, and how to reshape out data. Their core syntax is identical: gen variable = expression or Sep 6, 2018 · Here's one way to do this. May 25, 2023 · How to create a variable that counts the number of occurrences of another variable (1 for first occurrence, 2 for second etc) Asked 2 years, 5 months ago Modified 2 years, 5 months ago Viewed 478 times Nov 6, 2011 · The output should be 100. Description egen creates a new variable of the optionally specified storage type equal to the given function based on arguments of that function. Nov 16, 2022 · How do I go through the groups of a variable in order of their first occurrence in the dataset? Jan 28, 2021 · I would like to create a variable ("new_var") that counts the number of distinct values of "var_of_interest" that are different from "BA". gen creates new variables; replace changes the values of existing variables. We have a little trouble with a, we think, easy task. We will illustrate this with the hsb2 data file with a variable called write that Learn how to count the number of observations in Stata using various methods and commands. Computing new variables using generate and replace References: st: number of distinct values for a variable in a group using -collapse- From: Lloyd Dumont <lloyddumont@yahoo. 1 Continuous, categorical, and indicator variables Although to Stata a variable is a variable, it is helpful to distinguish among three conceptual types: Hi All. missing indicates that missing values in varlist (either . I have also tried using: I'm new to Stata and I am trying in vain to create a new variable that I can use together with my other variables for a linear regression model. The relevant subset of my dataset looks like ID Dose Drug 11 1 A 11 2 B 12 2 A 12 . Ryan's solution is naturally correct. _n basically indexes observations (rows): _n = 1 is the first row, _n = 2 is the second, and so on. We want to generate a variable, which contains the relative frequency of another variable values. replace for replacing the values of an May 29, 2024 · In this notebook, we look at within-group analysis. Here is an example of the data with ID, year, and the job code (i. ucla. Then we tag the first occurrence of each value of x. com> Re: st: number of distinct values for a variable in a group using -collapse- From: "Dimitriy V. So I want statistics on number of observations, the mean and standard deviation by the following 15 I would like to use esttab (ssc install estout) to generate summary statistics by group with columns for the mean difference and significance. Jan 22, 2019 · I have a data set that includes variables on individual's district (where a person lives) and occupation. I want to first sort by group and date, and then perform a cumulative sum over one of the variables, but by group: In each group, I want to sum all previous values of the variable in that group, and then record this rolling or cumulative sum as another variable. dta. A single variable may be created containing a group number based on the requested number of groups or cutting the dendrogram at a specified (dis)similarity value. 4. in a number of variables (columns). I thought the following would be correct: egen total_id = count (id), by (category) But it seems to count the new total_id for every 'line'. generate order = _n If your dataset is really big, that should be . mean of others = (sum of all - this value) / (number of values - 1) It needs a little care given the possibility of missing values, but the -egen- functions do that for you. That would look like this: Jun 8, 2022 · I'm new to Stata and I am trying in vain to create a new variable that I can use together with my other variables for a linear regression model. Jul 19, 2016 · The number of observations (rows) in each group ranges from 3 to 20. How do I do that in Stata? I know that I Dec 10, 2015 · Is there perhaps another way (except using local/global) to define groups of variables that can easily used in a number of regressions? E. In Stata terms, duplicates are observations with identical values, either on all variables if no varlist is specified, or on a specified varlist; that is, 2 or more observations that are identical on all specified variables form a group of dupl Apr 21, 2020 · Documentation accessible through Stata includes this paper on composite categorical variables and this paper on handling dyadic data. 3. Uses egen count () with by, to create two new variables recording the raw number of employed / unemployed people in the region. com tions. We saw how to work with the Data Editor in [GSM] 6 Using the Data Editor—this chapter shows how we would do this from the Command window. Dec 19, 2021 · What you will find in frame default is the original data set, to which several variables have been added, including the variable wanted, which has been adjoined only to the observations of the starting job of any promotion. Let's use Stata's generate command to create a new variable for height measured in meters. Most Stata commands allow the by prefix, which repeats the command for each group of observations for which the values of the variables in varlist are the same. egen newvar = function (arguments) creates the new variable. stata. Type help egen to view a complete list and descriptions of the functions that go with egen number of quantiles; default is nquantiles(2) generate newvarp variable containing percentages use alternative formula for calculating percentiles codebook is a great command in Stata. May 14, 2020 · How to generate a variable that count how many observation I have per group 14 May 2020, 08:41 Hi everyone, Hope that you can help me. ) OK, enough of that. Feb 21, 2015 · Does anyone know the difference between the following two commands? egen variable_name = cut (X), group (4) xtile variable_name = X, nq (4) * Continuous variable X Nov 16, 2022 · Perhaps the identifier variable is a string — id "numbers" 1A038, 2B217, — and you need numeric identifiers — 1, 2, — because some Stata commands require them. I have tried this: egen Counter = count (ID), by (place) But I get a type mismatch. In particular, I would like the dataset to be like the following >How do I generate a new variable with its value for all observations equals to the first observation or the nth observation of >another variable? [in groups according to the subj] Stata has a system variable to number cases. The range in alc is [0, 1700]. I feel like this is a simple problem and I am sorry for the repetition in question. if there are 10 people in the 1st district and 3 are farmers, I want the new variable created to say 0. If somebody else following this thread understands what is wanted, do jump in with a solution. If no conditions are specified, count displays the number of observations in the data. Any suggestions? Answer: The question shows that no matter how many general or special purpose tabulation commands Stata provides, it is always possible to think of a tabulation problem that Nov 16, 2022 · For example, egen, group () could be used to group values according to one or more variables, and then the same method could be used on the resulting variable. We use count command to count the number of observations that meet a specific condition. reporter_iso and partner_iso are string variables. Meanwhile, id is Mar 10, 2016 · Overview I describe how to generate random numbers and discuss some features added in Stata 14. I have to run a regression only when I have at least 15 observations per year and industry. There are several ways to achieve this in Stata, in this post we'll use the egen command. oarc. One of my variables is hometeam. generate long order = _n We will sort into groups of x and ensure that within those groups the original order of observations is followed. Such questions often arise with panel data and in other circumstances. The order of the groups is that of the sort order of varlist. tmb wziab bhlnq vgzsdu ybwx kejufmrf vnu bcnbs gupjrg ngfsisn bqpvdxz fvajbm ongxy ykrg cslaco