r - 混淆矩阵错误

Question

我想使用 R 中的决策树分类构建预测模型。但当我运行此行时，我收到错误消息(错误:找不到函数“confusionMatrix”？？):

cmatrix <- confusionMatrix(predictions, worktest$YesNo)

那是什么意思？请帮助我。

the dput() output:
> dput(worktest$ICUtransfer)
Error in worktest$ICUtransfer : $ operator is invalid for atomic vectors
> dput(ICUtransfer)
Error in dput(ICUtransfer) : object 'ICUtransfer' not found
> dput(worktest)
c(2L, 15L, 19L, 20L, 21L, 34L, 36L, 37L, 39L, 41L)
> dput(fitted)
structure(c(0.689655172413793, 0.689655172413793, 0.689655172413793, 
0.454545454545455, 0.689655172413793, 0.454545454545455, 0.689655172413793, 
0.454545454545455, 0.689655172413793, 0.689655172413793, 0.310344827586207, 
0.310344827586207, 0.310344827586207, 0.545454545454546, 0.310344827586207, 
0.545454545454546, 0.310344827586207, 0.545454545454546, 0.310344827586207, 
0.310344827586207), .Dim = c(10L, 2L), .Dimnames = list(c("2", 
"15", "19", "20", "21", "34", "36", "37", "39", "41"), c("no", 
"yes")))
> 

Answer 1

尝试加载library(caret) lib。在我看来，您可能会遇到一些错误。

Loading required package: lattice
Loading required package: ggplot2
Error: package or namespace load failed for ‘ggplot2’ in loadNamespace(j <- i[[1L]], c(lib.loc, .libPaths()), versionCheck = vI[[j]]):
 there is no package called ‘Rcpp’
Error: package ‘ggplot2’ could not be loaded

它实际上显示无法加载Rcpp包，因此您需要安装它

解决方案:install.packages("Rcpp")