r random forest error - type of predictors in new data do not match

Question

I am trying to use quantile regression forest function in R (quantregForest) which is built on Random Forest package. I am getting a type mismatch error that I can\'t quite

Answer 1

I just solved doing the following:

## Creating sample data
values_development=factor(c("a", "b", "c")) ## Values used when building the random forest model
values_production=factor(c("a", "b", "c", "ooops")) ## New values to used when using the model

## Deleting cases which were not present when developing
values_production=sapply(as.character(values_production), function(x) if(x %in% values_development) x else NA)

## Creating the factor variable, (with the correct NA value level)
values_production=factor(values_production)

## Checking
values_production # =>  a     b     c