Xvalid_all function

A function to compute cross-validation errors

Xvalid_all(func, mf, maxL, n.fold, minbucket, minsplit, cp, lookahead)

Arguments

• func: the function used to fit the model
• mf: the data set with formula specified
• maxL: the maximum number of splits
• n.fold: the number of folds
• minbucket: the minimum number of the studies in a terminal node
• minsplit: the minimal number of studies in a parent node to be split
• cp: the stopping rule for decrease of between-subgroups Q. Any split that does not decrease the between-subgroups Q is not attempted.
• lookahead: an argument indicating whether to apply the "look-ahead" strategy when fitting the tree