[S] predict.tree with tssa object

Victor Moreno (V.Moreno@ico.scs.es)
Thu, 9 Jul 1998 16:16:43 +0100

Dear all,

I am trying to adapt F.Harrel's validate.tree in Hmisc to accept an
tssa object.

Function predict.tree should work with tssa objects according to the
documentation, and results seem correct when predictions are
calculated with the same dataset that generated the tssa object.

However, when "newdata" argument is used, the result is a unique
value for all observations. Since prediction seems bo be actually
done inside a C call, I can't trace where the problem is.

I would appreciate if somebody can help with this or give advise
to validate trees with survival data. I have tested also Rpart and
survtree but none seem to have ready validation functions.

Thank you - Victor

plattform: SPLUS 3.3 & 4.0 for win95

Victor Moreno V.Moreno@ico.scs.es
SERC Tel: 34-93 260 78 12
Institut Catala d'Oncologia Fax: 34-93 260 77 87
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