Article (Scientific journals)
A note on the item information function of the four-parameter logistic model
Magis, David
2013In Applied Psychological Measurement, 37, p. 304-315
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Keywords :
Item response theory; Four-parameter lgistic model; Item information function; Maximization
Abstract :
[en] This paper focuses on four-parameter logistic (4PL) model (Barton & Lord, 1981) as an extension of the usual three-parameter logistic (3PL) model with an upper asymptote possibly different from one. For a given item with fixed item parameters, Lord (1980) derived the value of the latent ability level that maximizes the item information function under the 3PL model. The purpose of this paper 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 outlined.
Disciplines :
Education & instruction
Author, co-author :
Magis, David ;  Université de Liège - ULiège > Département d'éducation et formation > Psychométrie et édumétrie
Language :
English
Title :
A note on the item information function of the four-parameter logistic model
Alternative titles :
[fr] Une note sur la fonction d'information d'item du modèle logistique à quatre paramètres
Publication date :
2013
Journal title :
Applied Psychological Measurement
ISSN :
0146-6216
eISSN :
1552-3497
Publisher :
SAGE Publications
Volume :
37
Pages :
304-315
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 01 January 2013

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