interactionModel {irtoys}

Interaction model

Description

Estimates the parameters of the interaction model. The plots can be produced with the appropriate plotting method.

Usage

interactionModel(x, eps = 0.1, rasch = FALSE)

Arguments

x

A matrix of responses: persons as rows, items as columns, entries are either 0 or 1, no missing data

eps

Convergence criterion, default is 1e-1

rasch

if TRUE, the Rasch model will be estimated instead.

Value

A matrix

Author(s)

Ivailo Partchev, using C code and theory by Gunter Maris

References

Shelby Haberman. The interaction model. Chapter in: Mathias von Davier & Claus H. Carstensen (Eds.) (2007). Multivariate and Mixture Distribution Rasch Models. New York:Springer