1.创建二叉树。
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class.tree <- rpart(Ownership~., data = dataset.df, control = rpart.control(maxdepth = 2), method = "class")
prp(class.tree, type = 1, extra = 1, under = TRUE split.font = 1, varlen = 0)#defult值
length(class,treevar[class.tree
var == "<leaf>"])计算叶结点数量
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