Re: st: svy subpop option and e(sample)

[Richard Williams <richardwilliams.ndu@gmail.com>]

At 10:08 AM 5/27/2011, Steven Samuels wrote:
> Hitesh
>
> After reading  Section 5.4 of Korn and Graubard (1999), I return to 
> Stas's advice: you need a good reason not to do the correct 
> analysis. Here lack of memory won't be a reason,  for,as you have 
> apparently surmised, you don't need to load the entire original data 
> set. Instead create _one_ dummy observation for each PSU that 
> contains no members of the sub-population. For this observation, set 
> the value of all the analysis variables to zero or to some other 
> convenient value.
Interesting. Would it be fairly straightforward to create an 
-svyextract- command then? It seems like such a command could be 
quite useful for those who would otherwise have to deal with massive 
data sets. Maybe even add a property to the svysettings so the dof 
would be right when analyzing the extract. This might be a good wish 
list item for Stata 12.
> There is one more thing to do: in the -svyset- statement, use the 
> -dof()- option to set the degrees of freedom to: number of PSUs with 
> members of the subpopulation minus number of  strata with 
> observations in the sub-population (Korn & Graubard, 1999, p. 209).
> Ref: Korn, Edward Lee, and Barry I Graubard. 1999. Analysis of 
> Health Surveys. New York: Wiley.
> Steve
> sjsamuels@gmail.com
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Richard Williams, Notre Dame Dept of Sociology
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