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st: re: count variable


From   Kit Baum <kitbaum@mac.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: re: count variable
Date   Sat, 2 Apr 2005 20:44:39 -0500

My previous solution created a dummy, not a counter, and I see that is not what is wanted. Andrew Felton's solution

sort ccode years
by ccode: gen nukecount = sum(nukes)

could also be written as

bys ccode (years): gen nukecount = sum(nukes)

although one would hope that since this is panel data that it has been declared as such by tsset; in that case no sorting is required.

But Paul Millar is wrong: GENERATE's sum function creates a running sum, not a constant as does EGEN's sum function. generate sum is indeed the right tool here.

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

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