QuadraticDiscriminantClassifier: Quadratic Discriminant Classifier

In RSSL: Implementations of Semi-Supervised Learning Approaches for Classification

Quadratic Discriminant Classifier

Description

Implementation of the quadratic discriminant classifier. Classes are modeled as Gaussians with different covariance matrices. The optimal covariance matrix and means for the classes are found using maximum likelihood, which, in this case, has a closed form solution.

Usage

QuadraticDiscriminantClassifier(X, y, prior = NULL, scale = FALSE, ...)

Arguments

X	matrix; Design matrix for labeled data
y	factor or integer vector; Label vector
prior	A matrix with class prior probabilities. If NULL, this will be estimated from the data
scale	logical; Should the features be normalized? (default: FALSE)
...	Not used

Value

S4 object of class LeastSquaresClassifier with the following slots:

modelform	weight vector
prior	the prior probabilities of the classes
mean	the estimates means of the classes
sigma	The estimated covariance matrix
classnames	a vector with the classnames for each of the classes
scaling	scaling object used to transform new observations

See Also

Other RSSL classifiers: EMLeastSquaresClassifier, EMLinearDiscriminantClassifier, GRFClassifier, ICLeastSquaresClassifier, ICLinearDiscriminantClassifier, KernelLeastSquaresClassifier, LaplacianKernelLeastSquaresClassifier(), LaplacianSVM, LeastSquaresClassifier, LinearDiscriminantClassifier, LinearSVM, LinearTSVM(), LogisticLossClassifier, LogisticRegression, MCLinearDiscriminantClassifier, MCNearestMeanClassifier, MCPLDA, MajorityClassClassifier, NearestMeanClassifier, S4VM, SVM, SelfLearning, TSVM, USMLeastSquaresClassifier, WellSVM, svmlin()

RSSL documentation built on March 31, 2023, 7:27 p.m.