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Re: st: RE: count


From   Maarten buis <maartenbuis@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: count
Date   Fri, 12 Oct 2007 22:09:47 +0100 (BST)

--- "Herrnstadt, Evan" <Herrnstadt@rff.org> wrote:
> sort year
> by year: gen count = _N

This works in principle, and nicely illustrates the power of the -by-
and -_N- combination, but you have to be careful when you have missing
values (these would be counted aswel). You can adjust this code to take
this into account, but it is probably easier and and saver to use
-contract-.

--Maarten

-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands

visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434

+31 20 5986715

http://home.fsw.vu.nl/m.buis/
-----------------------------------------


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