Plot the test characteristic curve — plot

Expected total score against person location. Structural fits draw one curve for each observed item pattern within the frame or facet design, and a fit with split items one curve per test form, as defined by test_information.

Usage

plot_tcc(fit, grid = NULL)

Arguments

fit: A fitted object from rasch.
grid: Logit grid.

Value

Called for its plotting side effect; invisibly NULL.

Examples

set.seed(1)
d <- seq(-2, 2, length.out = 6)
X <- matrix(rbinom(400 * 6, 1, plogis(outer(rnorm(400), d, "-"))), 400, 6)
colnames(X) <- paste0("I", 1:6)
plot_tcc(rasch(X))