March 2002 version of rpart, R version 2006-11-29
Terry M Therneau and Beth Atkinson <atkinson@mayo.edu>.
R port by Brian Ripley <ripley@stats.ox.ac.uk>.
Recursive partitioning and regression trees
R (>= 2.4.0), graphics, stats, grDevices
use under GPL 2 or later, or see file LICENCE
S-PLUS 6.x original at http://mayoresearch.mayo.edu/mayo/research/biostat/splusfunctions.cfm