[R] Problem with understanding output of Cox model

From: May, Roel <Roel.May_at_nina.no>
Date: Tue 13 Dec 2005 - 22:40:04 EST

Hi all,  

I am using a 'tricked' Cox Hazard regression model for discrete choice habitat modelling.
However, I'm having a hard time understanding the meaning of the first line the following part of the summary() output:  

Rsquare= 0.307 (max possible= 0.475 )
Likelihood ratio test= 91.8 on 12 df, p=2.23e-14 Wald test = 26.3 on 12 df, p=0.00977
Score (logrank) test = 58.6 on 12 df, p=4.03e-08  

Does anyone know how I can read the 'max possible' R-square? What does it signify?
Is it some kind of quasi-correlation; in which case I read it that I have explained 65% (i.e., 0.307/0.475) of the variation?  

I hope someone can help on this.
Thanks in advance,  

Cheers Roel    

Roel May
Norwegian Wolverine Project
Norwegian Institute for Nature Research (NINA) Tungasletta 2, N-7485 Trondheim, Norway
Tlf. +47 73 80 14 65, Mob. +47 95 78 59 95 Email roel.may@nina.no <mailto:roel.may@nina.no> Internett www.nina.no <http://www.nina.no/> , www.jerv.info <http://www.jerv.info/>  

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