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Re: st: pweight question


From   "Michael I. Lichter" <mlichter@buffalo.edu>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: pweight question
Date   Thu, 29 Apr 2010 16:03:45 -0400

Steve,

That does sound like a pweight, and if you know nothing else about the survey, you should treat it as a pweight.

The scale of the weights (what they sum to) doesn't tell you whether or not they are pweights. Scaling the variables to sum to the size of the sample is something you do when you expect to use a package (or command) that, like SPSS until recently, only accepts fweights.

Do you have any additional information about the design of the study? Are there any design variables (strata, clustering variables) in the dataset?

-ml

Steven Archambault wrote:
Hi all,

I have some meta data from a survey that says "A weight was calculated
based on the probability that the observation would be included in the
sample." It sounds like a probability weight. However, when I add up
all of the values in the corresponding weights column in the data, the
total is equal to the total number of observations. So, it seems like
these weights are more about how the observations are represented in
the sample. Does anybody have a suggestion as to what I should do with
this weight data? These are households in a cross country survey.

Thanks,
Steve
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Michael I. Lichter, Ph.D. <mlichter@buffalo.edu>
Research Assistant Professor & NRSA Fellow
UB Department of Family Medicine / Primary Care Research Institute
UB Clinical Center, 462 Grider Street, Buffalo, NY 14215
Office: CC 126 / Phone: 716-898-4751 / FAX: 716-898-3536

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