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Re: st: weighted population size smaller than sample size?


From   sjsamuels@gmail.com
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: weighted population size smaller than sample size?
Date   Mon, 4 May 2009 18:00:40 -0400

--

Ilana,  The estimated population size is the sum of the weights.  The
two totals are close, so it doesn't look like a wrong variable.
Weights can be less than 1 and you obviously have some. You would have
to consult the study documentation to see how if this is possible. In
telephone surveys, for example, they can arise when the same
respondent could have been identified through multiple telephones.  In
such a case the base weight is divided by the number of phones.
Perhaps something like that has happened.

-Steve


On Sun, May 3, 2009 at 1:41 PM, Akresh, Ilana Redstone
<redstone@illinois.edu> wrote:
> I am using Stata 9 and have svyset my data with a pweight. The number of observations is 8572. When I run a weighted mean (svy: mean x) I get a population size that is smaller than the sample size (population size = 8545). How is this possible? Is there something wrong with the weight or with how I have svyset the data or something else?
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