A note on item information in any direction for the multidimensional three-parameter logistic model Authors
First Online: 10 April 2005 DOI:
10.1007/s11336-003-1129-6 Cite this article as: Bryant, D.U. Psychometrika (2005) 70: 213. doi:10.1007/s11336-003-1129-6
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 (
θ max) in the direction of the item discrimination vector. Several corollaries are given. Implications for future research are discussed.
three-parameter logistic model
This research was supported in part by an Educational Testing Service (ETS) Harold T. Gulliksen Psychometric Research Fellowship to the author.
This revised article was published online in August 2005 with the PDF paginated correctly.
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