与我的数据集中一样,Leakage有两个值1,0.只有大约300行1和569378行中的额外行1.这就是我在rpart结果中得到1个根的原因.
我怎么解决这个问题？
fm.pipe<-Leakage~PipeAge +PipePressure
> printcp(CART.fit)
Regression tree:
rpart(formula = fm.pipe, data = Data)
Variables actually used in tree construction:
character(0)
Root node error: 299.84/569378 = 0.00052661
n= 569378
CP nsplit rel error xerror xstd
1 0.0033246 0 1 0 0