| Date: | Tue, 30 Sep 2003 15:02:46 -0400 |
|---|
| Reply-To: | Laurel Copeland <laurel.copeland@MED.VA.GOV> |
|---|
| Sender: | "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU> |
|---|
| From: | Laurel Copeland <laurel.copeland@MED.VA.GOV> |
|---|
| Subject: | Proportion of Variance Explained by Each Predictor in Logistic
Regression |
|---|
| Content-Type: | text/plain; charset=ISO-8859-1 |
|---|
I would like to calculate the proportion of the variance explained by each
predictor in a multiple logistic regression (see for example Lai et al.
(2002) Urology 56:108-115, Radical prostatectomy: geographic and
demographic variation).
Lai et al. wrote their own program to do this (I don't know in what – maybe
S-PLUS).
I have received a macro that calculates some R2 values by pulling out of
PROC LOGISTIC the INTERCEPT (OUT=...) and XBETA and P (OUTEST=...) and
going on from there, but it does not calculate the contributions to PVE
from each predictor.
Does anyone know how to do this?
Thank you,
Laurel Copeland
Ann Arbor MI
| 
