Arguments
minsplit
the minimum number of observations that must exist in a node, in order for
a split to be attempted.
minbucket
the minimum number of observations in any terminal minbucket or minsplit is specified, the code either sets
minsplit to minbucket*3 or minbucket to <
cp
complexity parameter. Any split that does not decrease the overall lack of
fit by a factor of cp is not attempted. For instance, with anova splitting,
this means that the overall Rsquare must increase by cp at each
maxcompete
the number of competitor splits retained in the output. It is useful to
know not just which split was chosen, but which variable came in second,
third, etc.
maxsurrogate
the number of surrogate splits retained in the output. If this is set to
zero the compute time will be shortened, since approximately half of the
computational time (other than setup) is used in the search for surrogate
splits.
usesurrogate
how to use surrogates in the splitting process. 0= display only; an
observation with a missing value for the primary split rule is not sent
further down the tree. 1= use surrogates, in order, to split subjects
missing the primary variable; if all surrog
xval
number of cross-validations