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st: Re: How to list just the first case meeting a selection criterion?
Given the large dataset, I would just drop all of the cases after the first
for each criteria grouping, the you can list whatever you like quickly and
bysort county precinct: keep if _n==1
Then you could:
list if county==xxx & precinct==y
It will be much faster working with the reduced dataset. Just remember not
----- Original Message -----
From: "paul gronke" <email@example.com>
Sent: Monday, June 27, 2005 7:09 PM
Subject: st: How to list just the first case meeting a selection criterion?
I am dealing with an extremely large (2 gig) dataset and wish to list
just the first case that meets a set of criteria. There are about 200
separate sets of criteria (county and precinct values).
Thus, I'd like a command that does something like:
list name address1 address2 county precinct city state
if [first one of] county=VALUE & precinct=VALUE
repeated about 200 times.
I could do this with
sample 1 if CRITERIA
but that seems needless complex, especially since all I want is the
first case that meets 200 combinations of county and precinct.
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