Abstract
A model for the measurement of the discrepancy between two scores is presented and discussed as a paradigm for the study of growth or experimentally produced change. The model assumes two tests or measures differing in complexity, and it analyzes the true difference between the test scores into a component that is entirely dependent on the first or base-line test and a second component that is entirely independent of it. Equations for estimating both components are given and these are compared with other measurement efforts with similar goals.
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This research was supported in part by a grant from the United States Public Health Service, National Institute of Mental Health No. M-4186. We are greatly indebted to Harold Gulliksen and Frederic Lord for a careful reading of this manuscript and for their many valuable suggestions. The work of Gerri Nagy and Marie Davis in typing and proof-reading is gratefully acknowledged.
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Tucker, L.R., Damarin, F. & Messick, S. A base-free measure of change. Psychometrika 31, 457–473 (1966). https://doi.org/10.1007/BF02289517
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DOI: https://doi.org/10.1007/BF02289517