Thanks for directing my attention to the survey package and svyolr().
Best,
Greg
.............................................................
Gregory Wawro [EMAIL PROTECTED]
Associate Professor phone: 212-854-8540
Dept. of Political Science fax: 212-222-0598
741 International Affairs http://www.columbia.edu/~gjw10/
Columbia University
New York, NY 10027
.............................................................
On Mon, 22 Sep 2008, Thomas Lumley wrote:
On Mon, 22 Sep 2008, Gregory Wawro wrote:
Hello,
I'm estimating an ordered logit model on a probability weighted survey
sample.
You could use svyolr() in the survey package.
polr permits case weights with the "weights" option, but I cannot figure
out from existing documentation what it actually does with these weights.
They are frequency weights.
I'm concerned about this because I get somewhat different results using
Stata's ologit command with the pweights option
You should get the same point estimates, but different standard errors.
and very different results using proc logistic in SAS with its weight
option.
Again, it should be the same point estimates but different standard errors.
So my basic question is whether or not it is appropriate to use the weight
option for polr with my data.
No.
-thomas
Thomas Lumley Assoc. Professor, Biostatistics
[EMAIL PROTECTED] University of Washington, Seattle
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
