TestDesign (version 1.0.2)

calc_info: Calculate the Fisher information matrix for a single theta value and a set of items, potentially with a mixture of different models

Description

Calculate the Fisher information matrix for a single theta value and a set of items, potentially with a mixture of different models

Usage

calc_info(x, item_parm, ncat, model)

Arguments

x

Numeric. A single theta value.

item_parm

A matrix of item parameters.

ncat

A numeric vector of the number of response categories by item.

model

A numeric vector indicating the IRT models of each item (1: 1PL, 2: 2PL, 3: 3PL, 4: PC, 5: GPC, 6: GR).