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Denoting the Base-Free Measure of Change

Published online by Cambridge University Press:  01 January 2025

Samuel Messick
Samuel Messick*
Affiliation:
Educational Testing Service
*
Requests for reprints should be sent to Samuel Messick, Educational Testing Service, Princeton NJ 08541.
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Abstract

Bond criticized the base-free measure of change proposed by Tucker, Damarin, and Messick by pointing to an incorrect derivation which is here viewed instead as a correct derivation entailing an inadequately specified tacit assumption. Bond's revision leads to estimates of the correlation between initial position and change which are negatively biased by correlated errors, whereas the original approach, with the tacit assumption properly denoted, leads to unbiased values.

Keywords

base-free measure of changedifference scoreschange scoresmeasuring change
Type
Notes And Comments
Information
Psychometrika , Volume 46 , Issue 2 , June 1981 , pp. 215 - 217
Copyright
Copyright © 1981 The Psychometric Society

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