Plot the threshold map

Each item's threshold locations on a common logit scale, ordered by item location, with disordered thresholds highlighted.

Usage

plot_threshold_map(fit, order_by_location = TRUE)

Arguments

fit

A fitted object from rasch.

order_by_location

Order items by their location (the default) rather than their original sequence.

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_threshold_map(rasch(X))