在式接口添加相互作用中的R隨機森林

Question

rf = randomForest(Species ~.^4, data = iris) varImpPlot(rf)

代替加入相互作用varImpPlot僅示出了四個變量，它是真的使用額外的相互作用？

Answer 1

是。互動條款包括在你的射頻：

attr(rf$terms, "term.labels") 

[1] "Sepal.Length"          "Sepal.Width"          
[3] "Petal.Length"          "Petal.Width"          
[5] "Sepal.Length:Sepal.Width"       "Sepal.Length:Petal.Length"       
[7] "Sepal.Length:Petal.Width"       "Sepal.Width:Petal.Length"       
[9] "Sepal.Width:Petal.Width"       "Petal.Length:Petal.Width"       
[11] "Sepal.Length:Sepal.Width:Petal.Length"    "Sepal.Length:Sepal.Width:Petal.Width"    
[13] "Sepal.Length:Petal.Length:Petal.Width"    "Sepal.Width:Petal.Length:Petal.Width"    
[15] "Sepal.Length:Sepal.Width:Petal.Length:Petal.Width"