[R-pkgs] randomSurvivalForest 3.5.0 now available

From: Udaya B. Kogalur <ubk2101_at_columbia.edu>
Date: Mon, 28 Jul 2008 08:28:08 -0400


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



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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