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Re: st: Using -bitest- in the same way as -prtest varname, by(groupvar)-


From   Richard Williams <Richard.A.Williams.5@nd.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Using -bitest- in the same way as -prtest varname, by(groupvar)-
Date   Wed, 11 Aug 2004 00:02:30 -0500

At 11:47 PM 8/10/2004 -0400, Renzo Comolli wrote:
Dear Statlist,

The syntax
. prtest varname, by(groupvar)
allows to test for equality of proportions in two groups (defined by
groupvar).

I would like to do the same test but by using -bitest- which uses the
binomial
Ufortunately the syntax
. bitest varname, by(groupvar)
is not allowed.
Is there any way around it?
Are you concerned that the p-value using -prtest- is not exactly right? Not sure, but I think this will work (if not, somebody please correct me):

tab2 varname groupvar, chi2 exact

The chi-square value will be the square of the z value you get using -prtest-. You will also get Fisher's exact test, which I am assuming is what you want.


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Richard Williams, Notre Dame Dept of Sociology
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