irtoys (version 0.1.5)

sim: Simulate response data

Description

Simulate responses from the 1PL, 2PL, or 3PL model

Usage

sim(ip, x = NULL)

Arguments

ip

Item parameters: a matrix with one row per item, and three columns: [,1] item discrimination $a$, [,2] item difficulty $b$, and [,3] asymptote $c$.

x

A vector of values of the latent variable ("abilities").

Value

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

Examples

pa <- cbind(runif(20, 0.8, 2), runif(20, -2.4, 2.4), rep(0, 50))
rs <- sim(ip = pa, x = rnorm(1000))