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Re: st:-expand- to adjust according to the sampling weight


From   Steven Samuels <sjsamuels@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st:-expand- to adjust according to the sampling weight
Date   Mon, 20 Dec 2010 17:06:33 -0500

Without more details, we cannot advise you: What command, exactly? Does it take frequency weights? What is the study design? (panel, cross-ectional?) Were there clusters? strata? What's the purpose of your analysis?

Steve
sjsamuels@gmail.com


On Dec 20, 2010, at 8:29 AM, Amanda Fu wrote:

Dear Statalisters,

I have a question about how to use expand to adjust sampling weight
for the command that pw is not allowed to use. I know previous
discussion from this link
http://mail.google.com/mail/?hl=en&shva=1#search/expand+weight/ 12b6754ba71c32bd
talks some points about expand. But I am still not sure how to use
it.

Suppose I have there variables in the data set:X,Y, and sampling
weight. In order to use stata command that does not allow to use pw, I
am thinking to expand the data set according to weight.

------------------------------
X             Y            sweight
1              2             10
2              2.5           2
.....................
-----------------------------
Is it correct if I use
. gen tt_weight=sum(weight)
. expand sweight/tt_weight                          ?

Thanks for your help!

Sincerely,
Amanda
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