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Re: st: ANCOVA using only summary data


From   Marcos Vinicius <bioestatistico@inbox.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: ANCOVA using only summary data
Date   Thu, 22 Nov 2012 02:21:05 -0800

 Yes I would like to compare a continuous outcome variable among the 3 groups adjusting to a baseline covariate.
Unfortunately my data does not include the correlations you have cited. 
Thanks
Vinicius

> -----Original Message-----
> From: bioestatistico@inbox.com
> Sent: Thu, 22 Nov 2012 02:17:16 -0800
> To: statalist@hsphsun2.harvard.edu
> Subject: Re: st: ANCOVA using only summary data
> 
> Thank you David.Helped a lot.
> Vinicius.
> 
>> -----Original Message-----
>> From: dchoaglin@gmail.com
>> Sent: Wed, 21 Nov 2012 15:25:56 -0500
>> To: statalist@hsphsun2.harvard.edu
>> Subject: Re: st: ANCOVA using only summary data
>> 
>> Hi, Vinicius.
>> 
>> Did you mean to say that you would like to compare a continuous
>> outcome variable among the 3 groups?
>> 
>> Do your summary data include the correlation between the outcome and
>> the baseline measure within each of the 3 groups?  If so, it may be
>> possible to derive the quantities that you need for the analysis of
>> covariance (I haven't worked out the details).  If not, the answer is
>> No.
>> 
>> David Hoaglin
>> 
>> On Wed, Nov 21, 2012 at 11:50 AM, Marcos Vinicius
>> <bioestatistico@inbox.com> wrote:
>>> Hello,
>>> Is there a way to perform ANCOVA using only a summary data ( mean ,N,
>>> SD)?  If yes someone could share the stata code ?
>>> Many thanks,
>>> Vinicius.
>>> P.s:I would like to compare a continuous covariate among 3 groups
>>> adjusting for baseline measure.
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