|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
|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
Lai et al. wrote their own program to do this (I don't know in what – maybe
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?
Ann Arbor MI