A nearly complete port of the new survival5 package has been sent to CRAN
and will soon be appearing on a mirror near you in the contrib/devel
area.
This new package, the successor to survival4, has a more stable likelihood
maximiser for parametric survival models and incorporates penalised
likelihoods for adding smoothing splines, ridge regression, and
(approximately) frailties to survival models. User-defined penalties are
also possible.
It is in the devel area for two reasons
(1) There are some tests I want to run against S-PLUS, and we don't have
survival5 installed for S-PLUS yet.
(2) It calls R internal functions to implement the penalised regression.
The API for these has not been standardised yet and you need to install
the package from an R source tree.
Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle
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