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Re: st: RE: Using weights with tabulate command


From   Richard Williams <Richard.A.Williams.5@nd.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: Using weights with tabulate command
Date   Thu, 18 Mar 2004 11:34:23 -0500

At 04:11 PM 3/18/2004 +0000, Nick Cox wrote:
With -tabulate-, weights are assumed to be frequency
weights unless otherwise indicated. Your weights
sound like analytic weights.

. by country: tab illness [aw=weight01]

With -summarize- weights are assumed to be analytic
weights unless otherwise indicated.
Also, for the purposes of the tab command, he might want [iw=weight01]. It depends on what the goal is. This would give you the estimated number of households in each country that have a particular characteristic, e.g. there are are an estimated 400,000 people in the UK with illness 1. You might get Ns in the millions, even though the sample is only a few thousand. With aweights, the weights will be rescaled to reflect the sample Ns. -help weights- provides more info, even better is section 23.16 of the User's Guide. Stata's weighting options are more extensive than what I was used to so reading through that section was very helpful to me.


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Richard Williams, Notre Dame Dept of Sociology
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