Michael I. Lichter <[email protected]>:
Assuming you specify the same strata for both cases, there should be
no difference, I believe:
*note survwgt on SSC: ssc inst survwgt
webuse poststrata, clear
survwgt post weight, by(type) t(postwgt) replace
svyset, strata(type) poststrata(type) postweight(postwgt)
svy: mean totexp
qui svyset [pw=weight], strata(type)
svy: mean totexp
On Wed, Nov 26, 2008 at 12:38 PM, Michael I. Lichter
<[email protected]> wrote:
In the Stata svy commands, what is the difference between creating your own
poststratification weight (e.g. using -survwgt-) and treating it as a
pweight (through -svyset [pw=x], strata(y)-) vs. telling Stata (through
-svyset, poststrata(y) postweight(z)-) that you have a postratification
variable and cell count? This shouldn't affect point estimates, but how does
Stata treat the two differently with respect to variance calculations or
anything else? Thanks. (I would RTFM if I had access to one, and I didn't
find a FAQ or any discussion on the topic. I am using Stata 9.2, FWIW.)
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