R如何避免警告：在Ops.factor（y，yHat）中：' - '对因子无意义

Question

dane <- read.table(file = "http://archive.ics.uci.edu/ml/machine-learning-databases/breast-cancer-wisconsin/wpbc.data",sep=",", dec = ".")

library(randomForest) 
library(cvTools) 
cv <- cvFit(randomForest,  x=dane[,-2], y=dane[,2], R=10, k=100, args=list(ntree=500),foldType = "random",cost = rmspe) 

Answer 1

cvFit函数专为数字结果而设计。尽管randomForest对因子结果没有任何困难（在这种情况下它会进行分类），但结果正在由期望回归模型的函数处理。