Plot the test characteristic curve

Expected total score against person location. Structural fits draw one curve for each observed item pattern within the frame or facet design, 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))