Item characteristic curves of several items in a two-parameter logistic (2-PL) item response theory (IRT) model.
A = While drinking, I have said or done embarrassing things; B = Said things while drinking that you later regretted; C = The quality of my work or school work has suffered; D = Told by a friend or neighbor to stop or cut down on drinking; E = Gotten into trouble at work or school; F = Almost constantly think about drinking alcohol. Numbers in parenthesis indicate item discrimination and severity parameters, respectively.