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AW: st: calculating Fishers exact test and recording output for multiple two by two tables at once


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   AW: st: calculating Fishers exact test and recording output for multiple two by two tables at once
Date   Tue, 18 May 2010 09:09:33 +0200

<> 

"Perhaps the easiest way to do this is with -statsby-."



Re -statsby-, also see Nick`s recent column at
http://www.stata-journal.com/article.html?article=gr0045.




HTH
Martin

-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Phil Schumm
Gesendet: Dienstag, 18. Mai 2010 01:13
An: statalist@hsphsun2.harvard.edu
Betreff: Re: st: calculating Fishers exact test and recording output for
multiple two by two tables at once

On May 17, 2010, at 5:22 PM, Michael Walsh wrote:
> I would like to calculate a two-sided Fisher's exact test for many  
> studies in one data set and record the test value in a new column  
> (or file). The information from the two-by-two table occupies one  
> row for each study (col 1 = treatment events, col 2 = control  
> events, col 3 = treatment non-events, col 4 = control non-events).  
> Does anyone know of an existing Stata procedure that can accommodate  
> this?


Perhaps the easiest way to do this is with -statsby-.  For example,  
suppose that the two variables that comprise your two-by-two table(s)  
are called var1 and var2, and suppose that your studies are indexed by  
a variable called study.  In that case, the following will place the p- 
value and the cell frequencies into individual variables -- one  
observation per study:

     statsby p=r(p_exact) r1c1=mymat[1,1] r1c2=mymat[1,2] ///
                          r2c1=mymat[2,1] r2c2=mymat[2,2],  
by(study): ///
                          tab var1 var2, exact matcell(mymat)


-- Phil

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