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A Note on Item Information in Any Direction for the Multidimensional Three-Parameter Logistic Model

Published online by Cambridge University Press:  01 January 2025

Damon U. Bryant
Damon U. Bryant*
Affiliation:
University Of Central FLorida at Orlando
*
Requests for reprints should be sent to Damon U. Bryant, University of Central Florida, Department of Psychology, PH 215 Orlando, FL 32816-1390, USA. E-mail: dbryant@ucf.edu, Tel.: +1-321-4396733
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Abstract

The purpose of this note is twofold: (a) to present the formula for the item information function (IIF) in any direction for the Multidimensional 3-Parameter Logistic (M3-PL) model and (b) to give the equation for the location of maximum item information (θmax) in the direction of the item discrimination vector. Several corollaries are given. Implications for future research are discussed.

Keywords

item informationmeasurement directionmultidimensional measurementmaximum informationthree-parameter logistic model
Type
Original Paper
Information
Psychometrika , Volume 70 , Issue 1 , March 2005 , pp. 213 - 216
Copyright
Copyright © 2005 The Psychometric Society

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Footnotes

This research was supported in part by an Educational Testing Service (ETS) Harold T. Gulliksen Psychometric Research Fellowship to the author.

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