calc_likelihood_function

An equi-spaced grid of theta values.

theta_grid

A numeric matrix of item parameters.

item_parm

A numeric vector of item responses.

resp

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

ncat

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

model

Calculate a likelihood function of theta.

Use the optimal test design approach by Birnbaum (1968, ISBN:9781593119348) and
van der Linden (2018) <doi:10.1201/9781315117430> in constructing fixed and adaptive tests. Supports the following
mixed-integer programming (MIP) solver packages: 'lpsymphony', 'Rsymphony', 'gurobi', 'lpSolve', and 'Rglpk'. The 'gurobi' package
is not available from CRAN; see <https://www.gurobi.com/downloads>. See vignette for installing 'Rsymphony' package
on Mac systems.

calc_likelihood_function: Calculate a likelihood function of theta

Description

Usage

Arguments