--- On Wed, 18/3/09, moleps islon <[email protected]> wrote:
> -Is there an easy way to draw 40 random patients from a
> sample of 450 and generate a dummy variable containg 0 "not
> drawn" 1"drawn". E.g a command like : draw variable 40,
> gen(dummy)
When you want to create a dummy you implicitly assume that
you want to draw without replacement. There is an easy way
of doing this with replacement (as this is part of the
bootstrap): -bsample- with the -weight()- option. If you
realy want to sample without replacement you can adjust
the code below:
*---------- begin example ------------
sysuse auto, clear
// sort will store the original sort order
gen long sort = _n
// create your draw variable where you
// sample 40 respondents (cars) without
// replacement
gen u = runiform()
sort u
gen byte draw = _n <= 40
// restore the orginal sort order
sort sort
// clean up
drop u sort
*---------- end example ---------------
(For more on how to use examples I sent to the Statalist, see
http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html )
-- Maarten
-----------------------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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