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


From   Jorge Eduardo Pérez Pérez <[email protected]>
To   "[email protected]" <[email protected]>
Subject   st: -prtest- interpreting 1/2 as variable in one sample proportion test
Date   Wed, 17 Apr 2013 15:20:22 -0400

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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