Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: st: svy subpop option and e(sample)
From
Richard Williams <[email protected]>
To
[email protected], [email protected]
Subject
Re: st: svy subpop option and e(sample)
Date
Fri, 27 May 2011 11:25:12 -0500
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
[email protected]
-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME: (574)289-5227
EMAIL: [email protected]
WWW: http://www.nd.edu/~rwilliam
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/