R help - Feb 2008 - can we include nonparametric component for survival regression?

i am trying to fit a survival regression model (cox model or parametric
model) in R by including the covariate effects as a function m(x) instead of
just beta*x. is it possible to fit such a model? can someone recommend some
reference? I searched but only found a package called addreg where
the hazard is actually modeled additively. That is not what i want.

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On Mon, 18 Feb 2008, gallon li wrote:
> i am trying to fit a survival regression model (cox model or parametric
> model) in R by including the covariate effects as a function m(x) instead
of
> just beta*x. is it possible to fit such a model? can someone recommend some
> reference? I searched but only found a package called addreg where
> the hazard is actually modeled additively. That is not what i want.
The survival package has pspline() for this purpose (assuming that by 
'non-parametric' you mean a flexible smooth curve)

 	-thomas

Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle