CONFIDENCE ENVELOPES FOR ITEM RESPONSE THEORY
David Thissen, Howard Wainer · ETS Research Report Series · 1983
ABSTRACT A statistical method is described and illustrated which provides confidence envelopes around item response functions. Examples of 95% confidence envelopes for the one‐, two‐, and three‐parameter logistic response models are given. In addition, we describe, N‐line plots, which show the genesis of the envelope as well as the density of lines in the confidence region. These too are illustrated for the one‐, two‐, and three‐parameter logistic models.