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