Date: Tue, 11 Aug 1998 13:23:59 -0500
Sender: "SAS(r) Discussion" <SAS-L@UGA.CC.UGA.EDU>
Organization: Duke University, Durham, NC, USA
Subject: Re: Weighted Logistic Regression
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> The sampling design used was a two-stage stratified cluster and i would like
> incorporate this when i use logistic regression. how i can do this.
Trisha, PROC LOGISTIC by itself does NOT incorporate the weight variable
correctly. You can check the results of the procedure yourself by running it
and without the weight statement. I seem to remember that the calculated
doesn't change when you add the weight statement.
There are several ways to get around this error.
1) The LOGITSE macro adjusts the variance using the "sandwich" correction
It is available at the SAS website but I will mail a copy of it directly to
2) Use the GLIMMIX macro for logistic regression using the EMPIRICLE option.
macro is installed with SAS in the STAT\SAMPLE directory.
3) Use PROC GENMOD.