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. Author manuscript; available in PMC: 2016 Mar 1.
Published in final edited form as: Psychol Addict Behav. 2014 Dec 29;29(1):34–48. doi: 10.1037/adb0000047

Figure 1.

Figure 1

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.