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

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