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

[Michael Norman Mitchell <Michael.Norman.Mitchell@gmail.com>]

Dear Mike

  I wonder if this example below will help. It has four columns named a 
b c and d, corresponding to the four frequencies you describe. I rename 
them to v1 v2 v3 v4, and reshape them to a long format. I then create 
the variable -event- and -trt- to correspond to event and treatment, and 
then use -tab- to create the fishers exact tests, and add -bysort id- to 
do this separately for each study.

  I hope this helps.

Michael N. Mitchell
See the Stata tidbit of the week at...
http://www.MichaelNormanMitchell.com


-- snip ---
clear
input id a b c d
1 5 9 3 5
2 1 5 3 7
3 2 9 4 3
end

rename a v1
rename b v2
rename c v3
rename d v4

reshape long v, i(id) j(condition)
generate event = 1 if inlist(condition,1,2)
replace  event = 0 if inlist(condition,3,4)
generate trt   = 1 if inlist(condition,1,3)
replace  trt   = 0 if inlist(condition,2,4)

bysort id: tab event trt [fw=v], exact
-- snip ---





On 2010-05-17 3.22 PM, Michael Walsh wrote:
> Hello all,
>
> 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?
>
> Thanks for considering,
> Mike
>
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