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

[Richard Williams <Richard.A.Williams.5@nd.edu>]

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.


-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
FAX:    (574)288-4373
HOME:   (574)289-5227
EMAIL:  Richard.A.Williams.5@ND.Edu
WWW (personal):    http://www.nd.edu/~rwilliam
WWW (department):    http://www.nd.edu/~soc

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/