Simulate 2PL item responses

Generates binary item responses from the model plogis(d + a * theta).

Usage

simulate_2pl(theta, item_pars)

Arguments

theta

Numeric vector of latent trait values.

item_pars

Item parameters in slope-intercept form. Supply a data frame or matrix with columns a/a1 and d, or a fitted mirt model.

Value

A binary response matrix with one row per value of theta and one column per item.

Examples

set.seed(1)
pars <- data.frame(a = c(1, 1.2), d = c(0, -0.5))
simulate_2pl(rnorm(5), pars)
#>      1 2
#> [1,] 0 0
#> [2,] 1 1
#> [3,] 0 1
#> [4,] 1 1
#> [5,] 0 1