On Fri, Oct 2, 2009 at 3:54 PM, Martin Weiss <[email protected]> wrote:
>
> <>
>
>
>
> -bysort- is always a good place to start for this sort of problem, but you
> also want to have a look at -collapse- and -contract-
>
Beat me to it!
Neil
--
"The combination of some data and an aching desire for an answer does
not ensure that a reasonable answer can be extracted from a given body
of data." ~ John Tukey (1986), "Sunset salvo". The American
Statistician 40(1).
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