I'm doing some tree-based modeling in both S-plus
version 6.0 for UNIX and S-plus 2000 in Windows
2000. My understanding is that the node splitting
is based on a reduction in deviance, which in the
case of regression trees is equivalent to using
the reduction in sum of squared deviations from
the means. Are there other choices available for
the splitting criterion for regression trees
either in the built-in S-plus tree functions or
those in the rpart library? If not, has anyone
implemented his/her own splitting criteria?
_______________________________________________________
Jeff Hammel Cognigen Corporation
Statistician 395 Youngs Rd.
(716)633-3463 ext 267 Williamsville, NY
14221
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