margin | R Documentation |
Compute or plot the margin of predictions from a randomForest classifier.
## S3 method for class 'randomForest' margin(x, ...) ## Default S3 method: margin(x, observed, ...) ## S3 method for class 'margin' plot(x, sort=TRUE, ...)
x |
an object of class |
observed |
the true response corresponding to the data in |
sort |
Should the data be sorted by their class labels? |
... |
other graphical parameters to be passed to |
For margin
, the margin of observations from the
randomForest
classifier (or whatever classifier that
produced the predicted probability matrix given to margin
).
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.
Robert Gentlemen, with slight modifications by Andy Liaw
randomForest
set.seed(1) data(iris) iris.rf <- randomForest(Species ~ ., iris, keep.forest=FALSE) plot(margin(iris.rf))
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