multinomreg.cv: Cross-validation for the multinomial regression

In Rfast2: A Collection of Efficient and Extremely Fast R Functions II

Cross-validation for the multinomial regression

Description

Cross-validation for the multinomial regression.

Usage

multinomreg.cv(y, x, folds = NULL, nfolds = 10, stratified = TRUE, 
               seed = FALSE, pred.ret = FALSE)

Arguments

y	The response variable. A numerical or a factor type vector.
x	A matrix or a data.frame with the predictor variables.
folds	A list with the indices of the folds.
nfolds	The number of folds to be used. This is taken into consideration only if "folds" is NULL.
stratified	Do you want the folds to be selected using stratified random sampling? This preserves the analogy of the samples of each group. Make this TRUE if you wish, but only for the classification. If you have regression (type = "R"), do not put this to TRUE as it will cause problems or return wrong results.
seed	If you set this to TRUE, the same folds will be created every time.
pred.ret	If you want the predicted values returned set this to TRUE.

Value

A list including:

preds	If pred.ret is TRUE the predicted values for each fold are returned as elements in a list.
crit	A vector whose length is equal to the number of k and is the accuracy metric for each k. For the classification case it is the percentage of correct classification.

Author(s)

Michail Tsagris.

R implementation and documentation: Michail Tsagris [e-mail].

References

Friedman J., Hastie T. and Tibshirani R. (2017). The elements of statistical learning. New York: Springer.

Bohning, D. (1992). Multinomial logistic regression algorithm. Annals of the Institute of Statistical Mathematics, 44(1): 197-200.

See Also

bigknn.cv, mle.lda, reg.mle.lda

Examples

x <- as.matrix(iris[, 1:2])
mod <- multinomreg.cv(iris[, 5], x)

Rfast2 documentation built on May 29, 2024, 8:45 a.m.