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Re: st: -prtest- interpreting 1/2 as variable in one sample proportion test


From   Richard Goldstein <richgold@ix.netcom.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: -prtest- interpreting 1/2 as variable in one sample proportion test
Date   Wed, 17 Apr 2013 15:29:24 -0400

for -prtest- you need to .5 rather than 1/2; see the help file

Rich

On 4/17/13 3:20 PM, Jorge Eduardo Pérez Pérez wrote:
> Dear Statalist.
> 
> I found the following problem while using -prtest- on Stata S.E. 11.1
> 64bit , on Windows 7.
> 
> While running proportion tests, if I run the following binomial test:
> 
> bys id: bitest above == 1/2  if round<=10
> 
> The test executes correctly. However, when using the parametric proportion test:
> 
> bys id: prtest above == 1/2  if round<=10
> 
> I get:
> 
> 1/2   is not a 0/1 variable
> r(450);
> 
> 
> It seems like -prtest- is misinterpreting the 1/2 and reading it as a
> string, so it reads as a variable and Stata tries to conduct a
> two-sample proportion test.
> 
> This looks like a bug, but I may be missing something. Can someone
> replicate this in Stata 12? I am working with the 16 feb 2012 version
> of Stata 11 (The system administrators don't update Stata as they
> should) Maybe this has been corrected in an update.
> 
> Thanks,
> _______________________
> Jorge Eduardo Pérez Pérez
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