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unexpectebly
2009 Apr 30
1
unexpected behavior of rpart 3.1-43, loss matrix
Hi,
I just noticed that rpart behaves unexpectecly, when performing
classification learning and specifying a loss matrix.
if the response variable y is a factor and if not all levels of the
factor occur in the observations, rpart exits with an error:
> df=data.frame(attr=1:5,class=factor(c(2,3,1,5,3),levels=1:6))
> rpart(class~attr,df,parm...