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Re: st: Why does one command "lose" observations compared to another command?


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Why does one command "lose" observations compared to another command?
Date   Sun, 22 Jan 2006 13:02:29 -0500

At 11:56 AM 1/22/2006, Suzy wrote:
Dear Stata Listmembers:

I have come across a problem that I can't figure out. I don't know why I am "losing" 873 observations with one stata command versus the other -
for mean age by race, if age>=18. Both age and race are 100% present in the total dataset - total (N=21004) and for age>=18 (N=11,441).

This is complex survey data and of course, I would use the survey commands for analysis, but it still doesn't make sense why the non-survey command would use less observations (even so, the point estimates are identical.

Any insight into this would be greatly appreciated.
* Is the data svyset using mecwt4?

* Make sure you have the latest update of Stata. There have been some patches in the last two weeks, some of which affect svy-related commands.


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Richard Williams, Notre Dame Dept of Sociology
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