predict.majority: Classify Observations with the Majority Classifier

In schiffner/locClass: Collection of Local Classification Methods

Description

Classify observations in conjunction with majority.

Usage

predict.majority(object, newdata, ...)

Arguments

object	Object of class "majority".
newdata	A data.frame of cases to be classified or, if object has a formula, a data.frame with columns of the same names as the variables used. A vector will be interpreted as a row vector. If newdata is missing, an attempt will be made to retrieve the data used to fit the majority object.
...	Further arguments.

Details

This function is a method for the generic function predict() for class "majority". It can be invoked by calling predict(x) for an object x of the appropriate class, or directly by calling predict.majority(x) regardless of the class of the object.

Value

A list with components:

class	The predicted class labels (a factor).
posterior	Matrix of class posterior probabilities.

See Also

Other majority: majorityGenerative, majority, predict.majorityGenerative

Examples

library(mlbench)
data(PimaIndiansDiabetes)

train <- sample(nrow(PimaIndiansDiabetes), 500)

# weighting observations from classes pos and neg according to their
# frequency in the data set:
ws <- as.numeric(1/table(PimaIndiansDiabetes$diabetes)
    [PimaIndiansDiabetes$diabetes])

fit <- majority(diabetes ~ ., data = PimaIndiansDiabetes, weights = ws,
    subset = train)
pred <- predict(fit, newdata = PimaIndiansDiabetes[-train,])
mean(pred$class != PimaIndiansDiabetes$diabetes[-train])

schiffner/locClass documentation built on May 29, 2019, 3:39 p.m.