Plot uncertainty for flexible item response functions — plot_irf

For the bundled spline-reference engine, standard errors are derived on the logit scale from the fitted GLM and transformed to response probabilities. Exact GPIRT engines should supply their own posterior uncertainty summaries.

Usage

plot_irf_uncertainty(
  object,
  item = 1L,
  theta_grid = seq(-4, 4, length.out = 101),
  level = 0.95,
  ...
)

Arguments

object: An `eye_gpirt` object.
item: Item name or index.
theta_grid: Trait grid.
level: Pointwise confidence level for the spline-reference diagnostic.
...: Graphical arguments.