Psychometrika

, Volume 70, Issue 1, pp 213–216 | Cite as

A note on item information in any direction for the multidimensional three-parameter logistic model

Article

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 information measurement direction multidimensional measurement maximum information three-parameter logistic model 

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Copyright information

© The Psychometric Society 2005

Authors and Affiliations

  1. 1.University Of Central FLorida At OrlandoUSA
  2. 2.Department of PsychologyUniversity of Central FloridaOrlandoUSA

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