Compute or plot the margin of predictions from a randomForest classifier.
Usage
margin(rf, observed)
## S3 method for class 'margin':
plot(x, sort=TRUE, ...)
Arguments
rf
an object of class randomForest, whose
type is not regression.
observed
the response variable (a factor) used to train
rf.
x
an object of class margin, as returned by the function
margin.
sort
Should the data be sorted by their class labels?
...
other graphical parameters to be passed to plot.default.
Value
For margin, the margin of observations from the
randomForest classifier. The margin of a data point is defined as the
proportion of votes for the correct class minus maximum proportion of
votes for the other classes. Thus under majority votes, positive
margin means correct classification, and vice versa.