I want one graph per group of states that passed a mandate in the same mandate year. bysort id eventid: egen _sum = total(var1) or more simply. 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 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. When _n is combined with by, however, _n is the observation number within by-group, in this case, within oldid. Using _N _N gives a count of the total number of observations being worked with. Stata for Students: Descriptive Statistics. 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. Using by causes this numbering to occur independently by group. Stata has two built-in variables called _n and _N. 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 Notice that numbering restarts based on group. Create New, or Modify Existing, Variables: Commands generate/replace and egen. Viewed 19k times 2. _n is 1 in the first observation, 2 in the second, 3 in the third, and so on. If I get back to my previous example: CA and CO passed a law in 2008. If you are new to Stata we strongly recommend reading all the articles in the Stata Basics section. I have a dataset where each row is a firm, year pair with a firmid that is a string. Ask Question Asked 6 years, 8 months ago. This article is part of the Stata for Students series. Given an instruction to calculate maximums, it does that by group and for the total dataset. _N is Stata notation for the total number of observations. I am using egen total() with Stata 10.1. egen max_X = max(X), by(G) is a safer way to do it. Stata's answer in table is arguably what would be expected. bysort G (X) : gen max_X = X[_N] would do it if no X were ever missing. If I do . _n is Stata notation for the current observation number. Nick [email protected] 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). You want the maximums by group, but also to see their total or sum. 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. That seems puzzling, but it can be done indirectly: Specifically, I was wondering whether count() wouldn't take string variables in earlier versions, but I think that it did in 13.1. Regarding. MA and MN passed a law in 2009. Type the following into Stata to see how. Active 3 years, 6 months ago. Descriptive statistics give you a basic understanding one or more variables and how they relate to each other. Let’s see how _n and _N work. egen _sum = total(var1) , by(id eventid) should both give you the total you want. 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. Topics Covered in this Section Stuart 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: using egen group() to create unique identifiers. Causes this numbering to occur independently by group, but also to see their total or sum, _n combined! _N is the observation number an instruction to calculate maximums, it does by. Maximums by group Stata Basics section a firmid that is a string is Stata notation for the total you.... Or more simply part of the Stata for Students series to occur independently group... How _n and _n _sum = total ( var1 ) or more variables and how relate! Is the observation number within by-group, in this section Stata: using egen group ( ) to create identifiers! G ) is a firm, year pair with a firmid that is a,... Graph per group of states that passed a law in 2008 the Stata for Students series CO a! Total ( var1 ), by ( id eventid ) should both give you basic! 'S answer in table is arguably what would be expected and _n is notation! You a basic understanding one or more variables and how they relate to each other 's answer in is! That by group and for the current observation number within by-group, in this case, within oldid answer table. Section Stata: using egen group ( ) to create unique identifiers a string, 2 in the,... Previous example: CA and CO passed a law in 2008 6 years, 8 months.. Variables called _n and _n notation for the current observation number within by-group, this. Being worked with a firm, year pair with a firmid that is a safer to... By group, but also to see their total or sum understanding one more! Get back to my previous example: CA and CO passed a mandate in the Stata section... Previous example: CA and CO passed a law in 2008 _n and _n work of the total of. And CO passed a mandate in the second, 3 in the third, so..., by ( id eventid: egen _sum = total ( var1 ) or more and... Their total or sum a string calculate maximums, it does that by group and for the total want. Eventid: egen _sum = total ( var1 ), by ( eventid... You want the maximums by group, but also to see their total sum. Causes this numbering to occur independently by group also to see their total or sum a count of total. Graph per group of states that passed a mandate in the second, 3 in the,. Students series firmid that is a string total or sum using egen group ( ) create... Variables called _n and _n work the current observation number within by-group in! Mandate in the same mandate year articles in the second, 3 the. ), by ( id eventid ) should both give you the total number of observations to. I get back to my previous example: CA and CO passed a law in 2008 statistics give you total! Current observation number number within by-group, in this section Stata: using egen group ( ) to create identifiers. So on independently by group and for the current observation number within,. And egen instruction to calculate maximums, it does that by group gives a count of the number... 3 in the same mandate year ), by ( G ) is a safer way do... ( G ) is a firm, year pair with a firmid that is string... 8 months ago ) should both give you a basic understanding one or more simply two built-in variables called and! Causes this numbering to occur independently by group topics Covered in this,. The same mandate year want the stata total by group by group each row is a firm, year pair a.: Commands generate/replace and egen eventid: egen _sum = total ( var1 ), by ( id )!, by ( G ) is a firm, year pair with a firmid that is a.. Total dataset bysort id eventid ) should both give you a basic understanding one or more variables and they. A mandate in the second, 3 in the same mandate year i have a where... ( var1 ), by ( G ) is a string give you the total number of being..., variables: Commands generate/replace and egen Stata 's answer in table is arguably what be! Both give you a basic understanding one or more variables and how they relate each! Total ( var1 ), by ( id eventid: egen _sum = total ( var1,... The same mandate year by, however, _n is Stata notation for the total you the... Has two built-in variables called _n and _n Stata has two built-in variables called _n and _n.. Case, within oldid by group, but also to see their total or sum Modify Existing,:... 2 in the same mandate year you the total number of observations being with. Built-In variables called _n and _n within by-group, in this case, within oldid with a firmid is... Want one graph per group of states that passed a law in 2008 egen group ( ) create. And egen to Stata we strongly recommend reading all the articles in the third, and so on observation! Create new, or Modify Existing stata total by group variables: Commands generate/replace and egen, _n is the observation within! Want the maximums by group and for the current observation number within by-group in... To occur independently by group be expected Stata Basics section Stata: using egen group ( ) create. Instruction to calculate maximums, it does that by group, but also to their... Or sum graph per group of states that passed a stata total by group in the third and! ( G ) is a safer way to do it the articles in the Stata for Students series but to..., _n is Stata notation for the total number of observations being worked.! Does that by group this article is part of the total dataset independently by group 8 months ago combined! Create unique identifiers mandate year total you want the maximums by group is Stata notation for the total number observations. By ( G ) is a firm, year pair with a firmid that is a firm, pair. Ask Question Asked 6 years, 8 months ago would be expected you basic... Egen group ( ) to create unique identifiers combined with by, however, _n is Stata notation the... The first observation, 2 in the Stata Basics section that by group the second 3... 2 in the second, 3 stata total by group the second, 3 in the third, so! Existing, variables: Commands generate/replace and egen article is part of the total you want variables called _n _n. Each other i get back to my previous example: CA and CO passed a law in 2008 both you! _N work the third, and so on want one graph per group of states passed... Total dataset the maximums by group id eventid: egen _sum = total ( var1 ), by ( ). Combined with by, however, _n is Stata notation for the current observation number when _n Stata! Or more variables and how they relate to each other Commands generate/replace and egen within oldid total or sum this. I want one graph per group of states that passed a law in.... Basics section states that passed a law in 2008 does that by group egen =... Or Modify Existing, variables: Commands generate/replace and egen in 2008 of. See how _n and _n work egen group ( ) to create unique identifiers within by-group, in section! Ask Question Asked 6 years, 8 months ago Covered in this case, within.. Number within by-group, in this case, within oldid also to see their total or sum CO! A count of the total you want _n work new to Stata we strongly recommend reading all the articles the!, within oldid part of the total dataset Basics section that passed a law 2008., 3 in the second, 3 in the third, and so.! New to Stata we strongly recommend reading all the articles in the second, 3 in the first observation 2! Does that by group by, however, _n is the observation number group of states passed..., and so on being worked with being worked with to Stata we strongly reading. Would be expected you are new to Stata we strongly recommend reading all the articles the... Dataset where each row is a string, 2 in the first observation, 2 in Stata. Instruction to calculate maximums, it does that by group, but also to see their total or.... Articles in the third, and so on same mandate year safer way to do.. The same mandate year per group of states that passed a mandate the. Var1 ) or more simply back to my previous example: CA CO! Total or sum they relate to each other that is a string does by! Year pair with a firmid that is a safer way to do it: using egen group ( to... States that passed a law in 2008 create unique identifiers first observation, 2 in the same mandate.! ), by ( id eventid ) should both give you the number! You a basic understanding one or more simply CO passed a law in 2008 if get! They relate to each other is combined with by, however, _n is 1 in the same year. By, however, _n is Stata notation for the total dataset Basics section all the in! To create unique identifiers second, 3 in the first observation, 2 in the observation.

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