R help - Jul 2008 - randomSurvivalForest 3.5.0 now available

Please find release 3.5.0 of the CRAN package "randomSurvivalForest"
now posted on CRAN.  Thank you.


ubk2101 at columbia.edu

Udaya B. Kogalur, Ph.D.
Kogalur Shear Corporation
5425 Nestleway Drive, Suite L1
Clemmons, NC 27012

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CHANGES TO RELEASE 3.5.0

RELEASE 3.5.0 represents a significant upgrade in the functionality of
the product.  Key changes are as follows:

o A random version of all computed split rules is now available.  See
the documentation for more details.

o The ability to handle factors has been implemented.  If the factor
is ordered, then splits are similar to real valued variables.  If the
factor is unordered, a split will move a subset of the levels in the
parent node to the left daughter, and the complementary subset to the
right daughter.  All possible complementary pairs are considered and
apply to factors with an unlimited number of levels.  However, for
deterministic splitting there is an optimization check to ensure that
the number of splits is not greater than the number of complementary
pairs in a node (this internal check will be overridden in random
splitting mode if nsplit is set high enough).  Note that when
predicting on test data involving factors, the factor labels in the
test data must be the same as in the grow (training) data.  Consider
setting labels that are unique in the test data to missing.

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