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A Conjunctive Parallelogram Model for Pick any/n Data

Published online by Cambridge University Press:  01 January 2025

Iwin Leenen
Affiliation:
Katholieke Universiteit Leuven
Iven Van Mechelen*
Affiliation:
Katholieke Universiteit Leuven
*
All correspondence concerning this paper is to be addressed to Iven Van Mechelen, Department of Psychology, K.U.Leuven, Tiensestraat 102, B-3000 Leuven, Belgium; email: iven.vanmechelen@psy.kuleuven.ac.be

Abstract

This paper proposes a multidimensional generalization of Coombs' (1964) parallelogram model for “pick any/n” data, which result from each of a number of subjects having selected a number of objects (s)he likes most from a prespecified set of n objects. In the model, persons and objects are represented in a low dimensional space defined by a set of ordinal variables with a prespecified number of categories; objects are represented as points and persons as intervals on each dimension. A conjunctive combination rule is assumed implying that a person selects an object if and only if the object is within the subject's interval on each dimension. An algorithm for fitting the model to a data set is presented and evaluated in a simulation study. The model is illustrated with data on preferences regarding holiday trips.

Information

Type
Theory and Methods
Copyright
Copyright © 2004 The Psychometric Society

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