Database Reference
In-Depth Information
Next, use the
predict
function to generate predictions from a fitted
rpart
object.
The format of the
predict
function follows.
predict(object, newdata = list(),
type = c("vector", "prob", "class", "matrix"))
Parameter
type
is a character string denoting the type of the predicted value. Set
it to either
prob
or
class
to predict using a decision tree model and receive the
result as either the class probabilities or just the class. The output shows that one
instance is classified as
Play
=
no
, and zero instances are classified as
Play
=
yes
.
Therefore, in both cases, the decision tree predicts that the play decision of the
testing set is not to play.
predict(fit,newdata=newdata,type="prob")
no yes
1 1 0
predict(fit,newdata=newdata,type="class")
1
no
Levels: no yes
