[R] any r package can handle factor levels not in the test set

HelponR suncertain at gmail.com
Tue Jan 13 03:00:19 CET 2015

It looks like gbm, glm all has this issue

I wonder if any R package is immune of this?

In reality, it is very normal that test data has data unseen in training
data. It looks like I have to give up R?


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