ProductProbabilities {DFIT}

Calculates the product of item response probabilities for dichotomous IRT models

Description

Calculates the product of item response probabilities for dichotomous IRT models

Usage

ProductProbabilities(thetaValue, itemParameters, logistic, irtModel = "3pl")

Arguments

thetaValue

A numeric value or array for the theta (ability) value(s) for which the product will be calculated

itemParameters

A matrix containing the item parameters.

logistic

A logical indicating whether the logistic or the normal metric should be used.

irtModel

A string stating the irtModel used. May be one of "1pl", "2pl", or "3pl".

Value

pq A numeric matrix containing the crossed product on each thetaValue for each item.

Author(s)

Victor H. Cervantes <vhcervantesb at unal.edu.co>