ProductProbabilities: Calculates the product of item response probabilities for...

In DFIT: Differential Functioning of Items and Tests

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>

DFIT documentation built on Aug. 17, 2021, 9:07 a.m.