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Evaluating the Equal-Interval Hypothesis with Test Score Scales

Published online by Cambridge University Press:  01 January 2025

Ben Domingue*
Affiliation:
Institute of Behavioral Science, University of Colorado Boulder
*
Requests for reprints should be sent to Ben Domingue, Institute of Behavioral Science, University of Colorado Boulder, Boulder, CO, USA. E-mail: ben.domingue@gmail.com

Abstract

The axioms of additive conjoint measurement provide a means of testing the hypothesis that testing data can be placed onto a scale with equal-interval properties. However, the axioms are difficult to verify given that item responses may be subject to measurement error. A Bayesian method exists for imposing order restrictions from additive conjoint measurement while estimating the probability of a correct response. In this study an improved version of that methodology is evaluated via simulation. The approach is then applied to data from a reading assessment intentionally designed to support an equal-interval scaling.

Information

Type
Original Paper
Copyright
Copyright © 2013 The Psychometric Society

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