On Jan 22, 2006, at 11:56 AM, Suzy wrote [slightly edited]:
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).
Any insight into this would be greatly appreciated.
svy, subpop(if age>=18): mean age, over(race)
mean age [pweight = mecwt4] if age>=18, over(race)
Have you examined mecwt4 to confirm that it has all 11441
observations in your restricted sample?
-- Mike
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