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st: sum


From   Kit Baum <kitbaum@mac.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: sum
Date   Mon, 31 Oct 2005 12:21:07 -0500

Dirk wrote

I want to assign a dummy if the id (1,2,...13000) is smaller than a threshold
(5000) from another dummy

gen memberh=(id<=sum(member))

But it doesn't work for some reason, it seems sum(member) is always 1, but why?



Recall that generate's sum function is a RUNNING sum, not the total of member. You want egen sum to generate a variable that is a constant across obs. Using auto,

g junk = (price < sum(price))

will be zero in the first obs and 1 thereafter.

But rather than creating a new variable, why not just

summarize member,meanonly
g memberh = (id < =r(sum))



Kit Baum, Boston College Economics
http://ideas.repec.org/e/pba1.html


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