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