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Re: st: BOOTSTRAP and pweights


From   "Ben Jann" <ben.jann@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: BOOTSTRAP and pweights
Date   Tue, 13 Mar 2007 16:09:45 +0100

Sabrina asked about using pweights with the bootstrap and Jeff answered:
Question:  Why doesn't Stata allow weights with -bootstrap-?

Besides the book by Shao and Tu (1995), there are papers in the survey
literature on using the Bootstrap with complex survey data.  Unfortunately
there doesn't appear to be a single satisfactory method for Bootstrapping
data with sampling weights.
[...]
Shao, J. and D. Tu. 1995. The Jackknife and Bootstrap.  New York: Springer.
Stas gave some more references:
Shao, J. (1996), 'Resampling methods in sample surveys', Statistics
27, 203–254. with discussion -- big and nice review.
[...]

I am not an expert on bootstrap or complex survey methods and I don't
have Shao and Tu (1995) at hand. But from Shao (1996) it appears that
sampling weights per se are not a problem for the naive bootstrap (see
page 222). Problems arise (1) if the units are sampled without
replacement and the sample size is large compared to the population
size and (2) if the number of sampled clusters per stratum is small.
It is clear from this that there is no easy solution for the bootstrap
with complex survey data in general, but the weights do not seem to
matter much. So the question remains: "Why doesn't Stata allow weights
with -bootstrap-?" It may be reasonable to disallow weights, if
cluster() or strata() is specified, but I don't see anything that
speaks against using weights if there is no clustering or
stratification. Or do I misunderstand Shao (1996)?

ben

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