fitQmat: Fit Q Matrix

In zzawadz/cdmQMatrix:

Description

Fit Q Matrix

Usage

fitQmat(scores, scores.test = scores, concepts.no = 2, delta = 0.1,
  qmat = NULL, niter = 50, init.method = c("NMF", "random"),
  verbose = FALSE)

Arguments

scores	table containing the students scores
scores.test	validation set.
concepts.no	number of concepts to fit
delta	step size for matrix exploration.
qmat	predefined qmatrix. If NULL (default) it will be initialized with one of the predefined methods.
niter	maximum number of iteration.
init.method	if qmat is null it will be created using one of the two methods - 'NMF' is based on Nonnegative Matrix Factorization or 'random' which is a random matrix.
verbose	if true, some additional information will be printed.

Examples

library(ltm)
data("WIRS")

fitQmat(WIRS, verbose = TRUE)

# Predefined matrix initialized with 0
fitQmat(WIRS, concepts.no = 2, qmat = matrix(0, ncol(WIRS), nrow = 2),verbose = TRUE)
# Predefined matrix initialized with 1
fitQmat(WIRS, concepts.no = 2, qmat = matrix(1, ncol(WIRS), nrow = 2),verbose = TRUE)

zzawadz/cdmQMatrix documentation built on May 8, 2019, 6:57 p.m.