[R] error in random forest

[David Katz]

I've had the same problem and solved it by removing the cases with the new
levels - they need to be handled some other way, either by building a new
model or reassigning the factor level to one in the training set.



Nagu wrote:
> 
> Hi,
> 
> I get the following error when I try to predict the probabilities of a
> test sample:
> 
> Error in predict.randomForest(fit.EBA.OM.rf.50, x.OM, type = "prob") :
>   New factor levels not present in the training data
> 
> I have about 630 predictor variables in the dataset x.OM (25 factor
> variables and the remaining are continuous variables). Any ideas on
> how to trace it?
> 
> Thank you,
> Nagu
> 
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