Random Forest command in R for selected variables All I can find online is how a random forest is run on all variables in a dataset using the period:
RF &lt;- randomForest(sale ~ ., data = TrainSet, importance = TRUE)
What if I only want to apply the RF to selected variables in the dataset? Would I need to drop the variables first?
I tried the following, but get an error:
RF &lt;- randomForest(sale ~ v1,v2,v3, data = TrainSet, importance = TRUE)
You have to do 

RF &lt;- randomForest(sale ~ v1 + v2 + v3, data = TrainSet, importance = TRUE)

this is the formula notation for R. It doesn't make a lot of sense for random forest models, but it is how it works.