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

["Michael S. Hanson" <mshanson@mac.com>]

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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