ProductProbabilities

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

thetaValue

A matrix containing the item parameters.

itemParameters

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

logistic

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

irtModel

Calculates the product of item response probabilities for dichotomous IRT models

A set of functions to perform Raju, van der Linden and Fleer's
(1995, <doi:10.1177/014662169501900405>) Differential Functioning of Items
and Tests (DFIT) analyses. It includes functions to use the Monte Carlo Item
Parameter Replication approach (Oshima, Raju, & Nanda, 2006, <doi:10.1111/j.1745-3984.2006.00001.x>)
for obtaining the associated statistical significance
tests cut-off points. They may also be used for a priori and post-hoc power
calculations (Cervantes, 2017, <doi:10.18637/jss.v076.i05>).

ProductProbabilities: Calculates the product of item response probabilities for dichotomous IRT models

Description

Usage

Arguments

Value