CODEWITHSUNDEEP
rparty
Jeroen Claes
Jeroen Claes

Reputation: 77

Somers's C with ctree() of the R package party

I have seen a few articles around that report Somer's Dxy and the C index (I presume with the somers2() function of e.g., Hmisc) for a conditional inference tree generated with ctree() from the R package party. However, I can't seem to find any references/guidelines as to how to compute Dxy and the C index for this function.

Could anyone provide me with some references/code to pull this off?

Thanks,

Jeroen Claes

Upvotes: 0

Views: 295

Answers (1)

user21510073
user21510073

Reputation: 13

You can find how to do it in Levshina, page 633.

Example code using the data in that page:

#create a vector of predicted probabilities

prob.cit <- unlist(predict(tv.cit, type = "prob"))

               [c(FALSE,TRUE)]
#compute the C-index using a function from the Hmisc package

somers2(prob.cit, as.numeric(tv$Form) - 1)

Upvotes: 1

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