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Re: st: chi-2 test on treatment and control groups


From   Ricardo Ovaldia <ovaldia@yahoo.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: chi-2 test on treatment and control groups
Date   Thu, 1 Sep 2005 16:31:32 -0700 (PDT)


--- Alexander Nervedi <alexnerdy@hotmail.com> wrote:

> 
> table year treatment, c(mean output)
> 
>                    Pre          Post
> -----------+------------------------+----------
>         Y1 |        26         33 |        99
>          Y2|        36         66 |       132
> -----------+------------------------+----------
>    Total |       62         99 |       231
> 
> provides me a distribution of the mean output across
> two pre-treatment and 
> two post-treatment years. is there any way i can get
> a report of chi2 test 
> for (Y2 (pre) & Y1 (post)), (Y1(pre) and Y2(post)
> and overall pre-and post?
> 
> The objective is see if there were statistically
> disntinguishable 
> differences in output across treatment and control
> groups.
> 
 
Your question is confusing. Are these counts? If not,
are you sure you want a chi-square?

Ricardo.

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