By Joel Michell

ISBN-10: 0805805664

ISBN-13: 9780805805666

This e-book declines to take with no consideration the common assumption that current psychometric methods offer medical dimension. The at present trendy techniques of size inside psychology -- operationalism and representationalism -- are significantly tested, and the classical view, that size is the evaluation of volume, is defended. inside of this framework, it's proven how conjoint dimension can be utilized to check the speculation that variables are quantitative. This topic is constructed intimately utilizing standard mental examples, resembling Thurstone's legislation of comparative judgment, multidimensional scaling, and Coombs' conception of unfolding.

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Bergmann & Spence, 1941). Not only the behaviorists, but also many psychometricians, found this construal of Bridgman’s principle agreeable. They were attempting to measure variables like intelligence, attitudes, and the intensity of sensations, variables that had been thought of as mentalistic. The issue of whether or not the procedures they used actually mea­ sured such variables lay unresolved in the background, not often addressed, but nagging. Operationalism appeared to solve their problems in one fell swoop.

This confusion is at its most general in 28 2. THE THEORY OF MEASUREMENT IN PSYCHOLOGY Bridgman’s Berkeley-like belief that “it is meaningless to separate ‘nature’ from ‘knowledge of nature’ ” (1927, p. 60). In the measurement context it takes the form of a confusion of “the act or process of measuring with the object of the act, namely the quantity in question” (Byerley, 1974, p. 376). The error here is simply that of confusing a relation with one of the entities involved in it. Knowing something, identifying it, or measuring it is a relation between the observer and the thing known, measured or identified.

In English, it found early articulation in Russell’s Principles o f Mathematics, when he wrote: Measurement of magnitudes is, in its most general sense, any method by which a unique and reciprocal correspondence is established between all or some of the magnitudes of a kind and all or some o f the numbers, integral, rational or real, as the case may be. (Russell, 1903 p. 176) Campbell’s (1920) was its most influential formulation and there it is applied to physical measurement, at least as it stood early this century.

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An Introduction To the Logic of Psychological Measurement by Joel Michell

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