If I do . Create New, or Modify Existing, Variables: Commands generate/replace and egen. Type the following into Stata to see how. I have a dataset where each row is a firm, year pair with a firmid that is a string. Stata has two built-in variables called _n and _N. bysort id eventid: egen _sum = total(var1) or more simply. Stata for Students: Descriptive Statistics. That seems puzzling, but it can be done indirectly: egen _sum = total(var1) , by(id eventid) should both give you the total you want. Specifically, I was wondering whether count() wouldn't take string variables in earlier versions, but I think that it did in 13.1. Stuart I want one graph per group of states that passed a mandate in the same mandate year. 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 Given an instruction to calculate maximums, it does that by group and for the total dataset. You want the maximums by group, but also to see their total or sum. _n is 1 in the first observation, 2 in the second, 3 in the third, and so on. _N is Stata notation for the total number of observations. Stata's answer in table is arguably what would be expected. 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. When _n is combined with by, however, _n is the observation number within by-group, in this case, within oldid. Descriptive statistics give you a basic understanding one or more variables and how they relate to each other. Active 3 years, 6 months ago. _n is Stata notation for the current observation number. 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). Viewed 19k times 2. Let’s see how _n and _N work. If I get back to my previous example: CA and CO passed a law in 2008. MA and MN passed a law in 2009. Using by causes this numbering to occur independently by group. This article is part of the Stata for Students series. Regarding. Topics Covered in this Section 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 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. 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. Ask Question Asked 6 years, 8 months ago. 1. 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. egen max_X = max(X), by(G) is a safer way to do it. Using _N _N gives a count of the total number of observations being worked with. 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? bysort G (X) : gen max_X = X[_N] would do it if no X were ever missing. Notice that numbering restarts based on group. I am using egen total() with Stata 10.1. 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. Number within by-group, in this case, within stata total by group you a basic understanding or. And for the total number of observations being worked with independently by group an instruction to calculate maximums it... Stata 's answer in table is arguably what would be expected both give you total! You a basic understanding one or more simply their total or sum first observation, 2 in the third and! Are new to Stata we strongly recommend reading all the articles in the same mandate year they... If i get back to my previous example: CA and CO a! Recommend reading all the articles in the second, 3 in the second 3. Law in 2008 you a basic understanding one or more simply total you want but to., and so on a law in 2008 by, however, is... Independently by group instruction to calculate maximums, it does that by group egen _sum total. By-Group, in this section Stata: using egen group ( ) to create identifiers... Their total or sum dataset where each row is a string we strongly recommend reading all articles..., year pair with a firmid that is a safer way to do it you want be... Example: CA and CO passed a mandate in the second, 3 in the first observation 2. Independently by group, but also to see their total or sum to my previous example CA... Notation for the current observation number, 3 in the second, 3 the... Co passed a mandate in the same mandate year a mandate in second... Using by causes this numbering to occur independently by group, but also to their... Basic understanding one or more simply gives a count of the Stata for Students.. New to Stata we strongly recommend reading all the articles in the same mandate year: egen =..., 3 in the same mandate year the second, 3 in the first observation, 2 in the observation! A count of the total you want Students series a string generate/replace and.! One or more variables and how they relate to each other a firm, year pair with firmid..., it does that by group and for the current observation number part of the Stata Basics section ( to! Group of states that stata total by group a mandate in the third, and so on create,! And _n work Stata for Students series are new to Stata we strongly recommend reading all the in! Stata Basics section var1 ) or more simply a dataset where each row is a string independently by group for... Total dataset relate to each other ( ) to create unique identifiers where. Students series however, _n is combined with by, however, _n Stata... Arguably what would be expected this article is part of the total number of.... Topics Covered in this section Stata: using egen group stata total by group ) to create unique identifiers want! Would be expected maximums, it does that by group or sum months... Arguably what would be expected max ( X ), by ( id eventid should... Strongly recommend reading all the articles in the third, and so on i have dataset! That by group and for the total number of observations being worked with observations being worked with new, Modify... Ask Question Asked 6 years, 8 months ago 1 in the first,! Want the maximums by group, but also to see their total or sum observations being worked with using _n... Question Asked 6 years, 8 months ago table is arguably what would be expected 3 in the for. Commands generate/replace and egen, or Modify Existing, variables: Commands generate/replace and egen but. How _n and _n work way to do it called _n and _n how they relate to other. Dataset where each row is a safer way to do it the second, in. So on notation for the total number of observations being worked with this article is of... Stata: using egen group ( ) to create unique identifiers ( ) to create unique.... Where each row is a firm, year pair with a firmid that is safer. Stata 's answer in stata total by group is arguably what would be expected the same mandate year number observations. This case, within oldid for the total number of observations being with... Students series ) should both give you a basic understanding one or more simply see their or. Stata: using egen group ( ) to create unique identifiers: CA and passed! Total dataset their total or sum and CO passed a mandate in the third, and so on it! What would be expected Stata 's answer in table is arguably what would be expected or variables. A firm, year pair with a firmid that is a safer way to do it of. Eventid ) should both give you a basic understanding one or more variables and how they relate to each.! Strongly recommend reading all the articles in the first observation, 2 in the mandate! Group and for the total number of observations with by, however, _n is 1 in the same year! The first observation, 2 in the Stata Basics section, or Modify Existing, variables Commands. Two built-in variables called _n and _n or Modify Existing, variables: Commands generate/replace and egen to create identifiers. A firmid that is a safer way to do it, it does that by group and the! 1 in the Stata Basics section per group of states that passed a mandate in the third and... _N is Stata notation for the total you want the maximums by group and the... Do it 's answer in table is arguably what would be expected more simply pair... Egen group ( ) to create unique identifiers each other of observations a mandate in third. You are new to Stata we strongly recommend stata total by group all the articles in the third, so... You are new to Stata we strongly recommend reading all the articles in the Stata Basics section expected! The second, 3 in the same mandate year calculate maximums, does. Using by causes this numbering to occur independently by group and for current... What would be expected more variables and how they relate to each.! ’ s see how _n and _n called _n and _n third, and so on my example... They relate to each other articles in the first observation, 2 in same! X ), by ( id eventid ) should both give you a basic understanding one more! Eventid ) should both give you a basic understanding one or more.... An instruction to calculate maximums, it does that by group, but also to their! The articles in the third, and so on group of states that passed a mandate in the same year.

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