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


From   "Alexander Nervedi" <alexnerdy@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: chi-2 test on treatment and control groups
Date   Thu, 01 Sep 2005 23:34:51 +0000

Hi Ricardo,

No these are means (units kilograms).

You are right I probably dont want the chi-square. But I do want something
like a t-test for the difference of means. Is there any tabular way i can
get it ?

arnab


>
>--- 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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