Title: A note on the item information function of the four-parameter logistic model
Authors: Magis, David # ×
Issue Date: 2013
Publisher: Sage Publications, Inc.
Series Title: Applied Psychological Measurement vol:37 issue:4 pages:304-315
Abstract: This article focuses on four-parameter logistic (4PL) model as an extension of the usual three-
parameter logistic (3PL) model with an upper asymptote possibly different from 1. For a given
item with fixed item parameters, Lord derived the value of the latent ability level that maximizes
the item information function under the 3PL model. The purpose of this article is to extend this
result to the 4PL model. A generic and algebraic method is developed for that purpose. The
result is practically illustrated by an example and several potential applications of this result are
ISSN: 0146-6216
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Quantitative Psychology and Individual Differences
× corresponding author
# (joint) last author

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