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Re: st: -svy: mean- with more than 400 subpopulations


From   jpitblado@stata.com (Jeff Pitblado, StataCorp LP)
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: -svy: mean- with more than 400 subpopulations
Date   Fri, 28 Jan 2011 18:18:31 -0600

Julian Reif <jreif@uchicago.edu> found a bug in Stata's -mean- command (also
present in -proportion-, -ratio-, and -total-) with two or more variables and
more than 400 subpopulations implied by the -over()- option:

> I am using the -svy: mean- command to calculate means for two different
> variables for 432 subgroups of a large survey and appear to be encountering
> a small bug.  It looks like Stata allows only 400 subgroups for the first
> variable, and then stores the 401-432 results under the name of the second
> variable twice (see output table below).  This is not just a display issue;
> typing -matrix list e(b)- at the prompt confirms that this is how the
> results are stored in the estimation matrices as well.  If I calculate the
> mean for only the first variable (i.e., -svy, over(group1 group2 group3):
> mean var1- instead of -svy, over(group1 group2 group3): mean var1 var2-)
> then the results are stored correctly.  

We have determined the cause and fixed it.

The fix should be available in the next ado-file update.

--Jeff
jpitblado@stata.com
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