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Re: st: egen question

From   David Kantor <>
Subject   Re: st: egen question
Date   Fri, 19 Nov 2010 20:54:32 -0500

Try this:

sort year jurisdiction
by year jurisdiction: gen int ncases= _N
by year jurisdiction: gen byte j = ncases>=5 & _n==1
by year: egen int njuris = total(j)

Possibly, you could condense the first two -gen-s to one line:
by year jurisdiction: gen int j =  _N>=5 & _n==1

The final result is a constant by year; you could, instead collapse it, if you prefer.


At 08:32 PM 11/19/2010, John wrote:
Dear Statalist,
I have a cross-sectional database of 50,000 individuals (cases)
diagnosed within one of 50 jurisdictions over a 16 year period.
For each year, I would like to tally the number of jurisdictions
diagnosing 5 or more cases.
Does anyone know of a simple way to generate this variable using
-egen- or some other method?
Many thanks,

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