Dear R community
I
have a question regarding the value of cost complexity parameter "k"
used in "tree" package for pruning purpose. In the example below i used k=0. But if i take the value k=NULL, then it will not plot the resultant tree. Any help in finding the
optimum value of "k" is requested. Please give some suggestion in this
regard. Thanks  

library(tree)
ds=iris; iris=transform(iris, Species = factor(Species, labels = letters[1:3]))
miris
<- tree(Species ~ ., data = iris, control=tree.control(nobs = 150,
minsize = 5, mincut = 2)); iris.prun=prune.tree(miris,
method=c("misclass"), best = NULL, k=0); iris.prun; summary(iris.prun);
plot(iris.prun)


 
best regards

Muhammad Azam 


      
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