[18947] in s-news-athena
[S] cox.zph
daemon@ATHENA.MIT.EDU (ecrfk@frost.csv.warwick.ac.uk)
Sun Aug 15 18:55:01 1999
From: ecrfk@frost.csv.warwick.ac.uk
Date: Sun, 15 Aug 1999 23:48:21 +0100 (BST)
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Sorry if this is too obvious. I am testing the Proportional Hazards
Hypothesis using cox.zph. If I understood well, a g(t) function must be
assumed. Four possibilities are at hand with S-Plus: "identity", "km", "log"
or "rank". What functions of time are this transformations assuming?
Thanks.
Jaime Gomez.
Visiting Fellow.
Department of Economics.
University of Warwick.
UK.
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