Observed-score equating as a test assembly problem

Linden van der, Wim J. and Luecht, Richard M. (1998) Observed-score equating as a test assembly problem. Psychometrika, 63 (4). pp. 401-418. ISSN 0033-3123

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Abstract:	A set of linear conditions on item response functions is derived that guarantees identical observed-score distributions on two test forms. The conditions can be added as constraints to a linear programming model for test assembly that assembles a new test form to have an observed-score distribution optimally equated to the distribution on an old form. For a well-designed item pool and items fitting the IRT model, use of the model results into observed-score pre-equating and prevents the necessity ofpost hoc equating by a conventional observed-score equating method. An empirical example illustrates the use of the model for an item pool from the Law School Admission Test.
Item Type:	Article
Copyright:	© 1998 The Psychometric Society
Faculty:	Behavioural Sciences (BS)
Research Group:	Research Methodology, Measurement and Data Analysis (OMD)
Link to this item:	http://purl.utwente.nl/publications/60234
Official URL:	http://dx.doi.org/10.1007/BF02294862
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