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Re: st: PWEIGHT question
If the weights were created based on externally-determined population
totals rather than on the survey design, the weights are
poststratification weights, not probability weights (pweights). The svy
procedures allow poststratification weights (which can be set using
-svyset-; see -help svyset-), but you would need to create a poststrata
identifier variable (assuming you don't already have one) and transform
the weights into cell counts. Simply treating the weights as pweights
should yield very similar if not identical results compared to formally
declared poststratification weights with svy procedures, and will in any
event get you much more reasonable results than if you used standard
SPSS weighting. (The SPSS Complex Samples add-on, however, does [mostly]
what the Stata svy commands do.)
Michael
Charles Man@CCR wrote:
Dear subscribers,
I am new to STATA. I want to know how to use pweight option.
I have a small telephone survey dataset of 500 cases which were
randomly drawn from a population of 7 million people. The dataset was
weighted according to income and sex distributions of the population.
In Stata, do I need to include [pw=weight] in all analyses? In SPSS,
people simply choose WEIGHT BY and don’t have to be concerned about
the weight type. However, in Stata, we have to determine which weight
type is appropriate. Is it Pweight or Fweight useful in my situation?
Which one is the most appropriate?
I look forward to your advice. Thanks a lot.
Best Regards,
Charles
--
Michael I. Lichter, Ph.D. <[email protected]>
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 125 / Phone: 716-898-4751 / FAX: 716-898-3536
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