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RE: st: RE: count

From   "Herrnstadt, Evan" <>
To   <>
Subject   RE: st: RE: count
Date   Fri, 12 Oct 2007 17:17:32 -0400

Thanks Maarten, good tip.


-----Original Message-----
[] On Behalf Of Maarten buis
Sent: Friday, October 12, 2007 5:10 PM
Subject: Re: st: RE: count

--- "Herrnstadt, Evan" <> 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


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

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