Version 1.1.0 Edited on December 12, 2022, to use the new as_draws_df() workflow. Context Someone recently posted a thread on the Stan forums asking how one might make item-characteristic curve (ICC) and item-information curve (IIC) plots for an item-response theory (IRT) model fit with brms. People were slow to provide answers and I came up disappointingly empty handed after a quick web search. The purpose of this blog post is to show how one might make ICC and IIC plots for brms IRT models ...
