Question

After running a randomForest, I have an object RF that contains a bunch of info. If I highlite the objects name and hit CTRL + R, I get the following:

> RF
    Call:
     randomForest(x = iris[-5], iris[5],      ntree = 50, sampsize = c(100), importance = TRUE,      do.trace = F, forest = TRUE) 
                   Type of random forest: regression
                         Number of trees: 50
    No. of variables tried at each split: 2

              Mean of squared residuals: 0.03852423
                        % Var explained: 13.13

My question is how would I just print the last line (% Var explained: 13.13)?
I know for some functions there is a call like hist$breaks that will give a specific part of the object. I can’t find anything similar for this object. Any suggestions?

Answer 1

The % variance explained is supposed to be analogous to an R^2 type value. If you look at ?randomForest you’ll see that one of the values in the object is accessed via $rsq. Just multiply that by 100.