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st: question about egen


From   Shige Song <sgsong@ucla.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: question about egen
Date   Thu, 17 Apr 2003 18:33:37 -0700

Dear All,

I am trying to use "egen newvar = count()" to generate a set of variables indicating frequency of old variables. The syntax is (as stated in the Reference manual):

egen nwear = count(exp)

I was wondering what this "(exp)" means (there is no example for this particular type of egen).

For example, I have variable GENDER (1: men, 2: women), CITY(a, b, c,d,e,f). I want to generate variables that show 1) number of men in each city, 2) number of women in each city, and 3) total number of people in each city. So I type:

sort CITY
by CITY: egen nm=count(GENDER==1)
by CITY: egen nw=count(GENDER==2)
by CITY: egen np=count(GENDER)

Stata generates all three variables with complains, but surprisingly, all three new generated variables are exactly identical (all equal the total number of people)! Can anyone please give me a hand? Thank you very much!

Best,
Shige Song
Department of Sociology, UCLA

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