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st: Swor and sample commands


From   karoline mortensen <karoline@umich.edu>
To   statalist@hsphsun2.harvard.edu
Subject   st: Swor and sample commands
Date   Thu, 22 May 2003 11:12:51 -0400 (EDT)

Hi,

I would like to randomly select (without replacement) 5% of my data, and
keep all the data that were not selected. I believe this rules out the
Stata "sample" command, because that discards the 95% of observations that
were not selected.

In other analyses I have used the very useful "swor" command (which allows
the option of keeping non-selected observations). However, now I want to
randomly select 5% (not an absolute count) of my observations, by an ID
variable, so 5% of each ID get selected. Swor seems to only allow an
absolute count to be selected. Is there another option that allows me to
randomly sample a certain percentage, while keeping all the observations
in the dataset?

Thanks in advance,
-Karoline Mortensen



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