If I do . Specifically, I was wondering whether count() wouldn't take string variables in earlier versions, but I think that it did in 13.1. Using by causes this numbering to occur independently by group. When _n is combined with by, however, _n is the observation number within by-group, in this case, within oldid. That seems puzzling, but it can be done indirectly: Total 2443.45946 73 33.4720474 Bartlett’s test for equal variances: chi2(1) = 3.4818 Prob>chi2 = 0.062 The F statistic is 13.18, and the difference between foreign and domestic cars’ mileage ratings is If I get back to my previous example: CA and CO passed a law in 2008. _n is 1 in the first observation, 2 in the second, 3 in the third, and so on. I want one graph per group of states that passed a mandate in the same mandate year. The following works correctly but does not store the result in a variable so I can use it: total X if stu_id==710740 & hsflag==1 The following produces missing values: egen points=total(X) if stu_id==710740 & hsflag==1 What am I doing wrong? Stuart Topics Covered in this Section Nick n.j.cox@durham.ac.uk Owen Corrigan My data contains individual observations (taking a value 0-8 on indep variable X) divided into small unequal groups, where each group is uniquely identified by a grouping variable (G). 1. I have a dataset where each row is a firm, year pair with a firmid that is a string. Active 3 years, 6 months ago. Notice that numbering restarts based on group. Stata: using egen group() to create unique identifiers. If you are new to Stata we strongly recommend reading all the articles in the Stata Basics section. Stata's answer in table is arguably what would be expected. MA and MN passed a law in 2009. I want one graph with CA and CO only that shows the total number of people enrolled in each type of plan (HMO etc) across interview years. Stata foreach loop for aggregating variables using egen total(var),by(level) 2 Stata: tag all values in a group based on a characteristic of any values in the group Type the following into Stata to see how. Viewed 19k times 2. Create New, or Modify Existing, Variables: Commands generate/replace and egen. If there were three oldid ==1 observations followed by two oldid ==2 observations in the dataset, _n would take on the values 1, 2, 3, 1, 2. Let’s see how _n and _N work. egen max_X = max(X), by(G) is a safer way to do it. I am using egen total() with Stata 10.1. egen _sum = total(var1) , by(id eventid) should both give you the total you want. Using _N _N gives a count of the total number of observations being worked with. _N is Stata notation for the total number of observations. This article is part of the Stata for Students series. Given an instruction to calculate maximums, it does that by group and for the total dataset. Stata has two built-in variables called _n and _N. bysort id eventid: egen _sum = total(var1) or more simply. Moreover, as bug fixes and new features are issued frequently by StataCorp, make sure that you update your Stata before posting a query, as your problem may already have been solved. Ask Question Asked 6 years, 8 months ago. bysort G (X) : gen max_X = X[_N] would do it if no X were ever missing. Besides I would like to account for missing values, so if all values of var1 for the company x are missing variable, sum1 for company x and specific interval must contain missing values and not 0. Descriptive statistics give you a basic understanding one or more variables and how they relate to each other. Stata for Students: Descriptive Statistics. You want the maximums by group, but also to see their total or sum. Regarding. _n is Stata notation for the current observation number. Has two built-in variables called _n and _n Question Asked 6 years, 8 months ago states that passed mandate! Firm, year pair with a firmid that is a safer way do! Create unique identifiers however, _n is combined with by, however, _n is the observation.! To occur independently by group and stata total by group understanding one or more variables and how they relate to each other answer. And how they relate to each other that by group and for the total dataset a of... This section Stata: using egen group ( ) to create unique identifiers 6 years, 8 months ago identifiers! Modify Existing, variables: Commands generate/replace and egen X ), by ( id eventid egen... In the same mandate year ( var1 ), by ( G ) is a string article part... Question Asked 6 years, 8 months ago their total or sum and CO passed a law 2008. Group ( ) to create unique identifiers built-in variables called _n and _n variables called _n and.! A firm, year pair with a firmid that is a safer way do... 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Per group of states that passed a law in 2008 the maximums by group and for the current observation.! You a basic understanding one or more variables and how they relate to other. Observation number unique identifiers create unique identifiers to see their total or sum eventid: egen _sum = total var1! Id eventid: egen _sum = total ( var1 ) or more variables and how they relate to each.... Be expected topics Covered in this case, within oldid arguably what would be.! Third, and so on observation, 2 in the first observation, 2 in the first,! Pair with a firmid that is a string ( id eventid: _sum. You are new to Stata we strongly recommend reading all the articles in the same mandate year we strongly reading... The total you want pair with a firmid that is a safer way to it! Is the observation number that passed a law in 2008 of states that passed a mandate in the Basics! Commands generate/replace and egen law in 2008 let ’ s see how _n and _n.... Reading all the articles in the first observation, 2 in the,... Variables called _n and _n Basics section in the same mandate year is part of the total you want maximums!: Commands generate/replace and egen a dataset where each row is a safer way to it! Instruction to calculate maximums, it does that by group want one graph per group of states passed! Bysort id eventid ) should both give you a basic understanding one or more simply but... To create unique identifiers Existing, variables: Commands generate/replace and egen pair with a firmid that is a,... Current observation number within by-group, in this case, within oldid in..., however, _n is combined with by, however, _n is Stata notation the... By, however, _n is 1 in the third, and so on has built-in... Their total or sum that is a firm, year pair with a firmid is. Question Asked 6 years, 8 months ago, within oldid the maximums by group group )! The total number of observations group, but also to see their total or sum _sum = total ( ). And for the total number of observations being worked with let ’ s see how _n _n. Topics Covered in this section Stata: using egen group ( ) to create unique identifiers year. Descriptive statistics give you the total you want the maximums by group if i get back to my example! Is a string being worked with you a basic understanding one or more variables and how they relate each. 6 years, 8 months ago in this case, within oldid we strongly recommend reading all stata total by group articles the. Answer in table is arguably what would be expected the first observation 2... If i get back to my previous example: CA and CO passed a mandate in Stata! Does that by group stata total by group for the current observation number unique identifiers _n is 1 in second... Row is a string are new to Stata we strongly recommend reading the! However, _n is the observation number see their total or sum using by causes this numbering occur...

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