Hi R Experts,

I need your help with two question regarding randomForest.


1.       When I run a Random Forest model how do I extract the formula I used so that I can store it in a character vector in a dataframe?
For example the dataframe might look like this if I am running models using the IRIS dataset
#ModelID,Type,

#001,RF,Species ~ Sepal.Length + Sepal.Width + Petal.Length + Petal.Width

fmi<-randomForest(Species~.,iris,mtry=3,ntry=500)
#I know one place where the information is in fmi$terms but not sure how to extract just the formula info. Or perhaps there is somewhere else in fmi that I could get this?


2.       How do I get the probabilities (probability-like values) from the model that was run? I know for the test set I can use predict. And I know to extract the classifications from the model I use fmi$predicted. But where are the probabilities?


Dan
Workforce Analyst
HRIM - Workforce Analytics & Metrics
LLNL


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