Simulates 1PL or 2PL responses

Simulates responses following a 1PL or 2PL model given item parameters assuming normally distributed person parameters.

Usage

item.logit(z, slope = 1, thr)

Arguments

z

A vector of item difficulties.

slope

A vector of item discrimination parameters. Default is 1 and equals a 1PL model.

thr

A vector of item threshold parameters.

Value

A list with two matrices. First matrix includes the responses, seconds matrix includes the correct response probabilities.

Author

Ulf Kroehne

Examples

z <- rnorm(30, 0, 1)
d <- item.logit(z = z, thr = 0)