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st: How to get the standard error and degrees of freedom of a linear combinations of estimates coming from independent samples with heterogeneous variances and sample sizes?
From 
 
Collado Diego <[email protected]> 
To 
 
"[email protected]" <[email protected]> 
Subject 
 
st: How to get the standard error and degrees of freedom of a linear combinations of estimates coming from independent samples with heterogeneous variances and sample sizes? 
Date 
 
Wed, 12 Feb 2014 12:10:19 +0000 
Dear Statalist,
I wish to calculate the mean of several estimates coming from independent samples with heterogeneous variances and sample sizes. Afterwards I would like to test whether there are significant differences between the mentioned estimates and their common mean. In order to do so, I need to get the standard error and degrees of freedom of this mean. 
Best wishes,
Diego Collado
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