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st: how to use frequency weights to determine oversampling


From   Yap Keng Loong <klyap@yahoo.com>
To   stata list <statalist@hsphsun2.harvard.edu>
Subject   st: how to use frequency weights to determine oversampling
Date   Sun, 22 Sep 2002 10:54:03 -0700 (PDT)

hi,

For a given dataset with oversampled variables, can I
use frequency weights to determine how many
observations were oversampled?

for example, in the NSFH dataset, if i do, "tabulate
M2BP01  [fweight=SAMWT*], does the table indicate
total number of observations including the duplicated
observations i.e, the oversampled ones, i.e., the
result of the command is the same as if you duplicated
each observation however many times and then ran the
command unweighted"?

* where SAMWT is the sampling weight (the inverse of
the overall probability of selection.  
The respondent's probability of selection is the
product of the household selection probability, the
within household selection probability,  and the
oversample household selection probability)

thanks
yap

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