Test and item information curves — gg_info • mirtverse

Test and item information curves

Usage

gg_info(
  x,
  type = c("test", "items", "se"),
  which.items = NULL,
  theta_lim = c(-4, 4)
)

Arguments

x: a unidimensional model returned by mirt::mirt().
type: "test" for the test information function with its conditional standard error, "items" for item information curves, or "se" for the conditional standard error of measurement alone.
which.items: items to include for type = "items".
theta_lim: range of the latent trait.

Value

A ggplot object.

Examples

mod <- mirt(expand.table(LSAT7), 1, verbose = FALSE)
gg_info(mod)

gg_info(mod, type = "items")