Using by causes this numbering to occur independently by group. egen max_X = max(X), by(G) is a safer way to do it. 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. That seems puzzling, but it can be done indirectly: _n is 1 in the first observation, 2 in the second, 3 in the third, and so on. Stata has two built-in variables called _n and _N. 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. This article is part of the Stata for Students series. Stuart egen _sum = total(var1) , by(id eventid) should both give you the total you want. bysort G (X) : gen max_X = X[_N] would do it if no X were ever missing. If I get back to my previous example: CA and CO passed a law in 2008. 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 total number of observations. Using _N _N gives a count of the total number of observations being worked with. Stata for Students: Descriptive Statistics. MA and MN passed a law in 2009. 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. If I do . Ask Question Asked 6 years, 8 months ago. 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. You want the maximums by group, but also to see their total or sum. Regarding. 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). Type the following into Stata to see how. 1. Create New, or Modify Existing, Variables: Commands generate/replace and egen. bysort id eventid: egen _sum = total(var1) or more simply. 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 Let’s see how _n and _N work. _n is Stata notation for the current observation number. Given an instruction to calculate maximums, it does that by group and for the total dataset. Stata: using egen group() to create unique identifiers. 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. Viewed 19k times 2. 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 Descriptive statistics give you a basic understanding one or more variables and how they relate to each other. Stata's answer in table is arguably what would be expected. Topics Covered in this Section If you are new to Stata we strongly recommend reading all the articles in the Stata Basics section. Notice that numbering restarts based on group. I am using egen total() with Stata 10.1. I want one graph per group of states that passed a mandate in the same mandate year. The same mandate year is arguably what would be expected 's answer in is... 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