By Joel Michell

This booklet declines to take without any consideration the frequent assumption that current psychometric techniques supply medical size. The at the moment stylish thoughts of dimension inside psychology -- operationalism and representationalism -- are severely tested, and the classical view, that size is the overview of volume, is defended. inside this framework, it's proven how conjoint size can be utilized to check the speculation that variables are quantitative. This topic is constructed intimately utilizing general mental examples, akin to Thurstone's legislation of comparative judgment, multidimensional scaling, and Coombs' thought of unfolding.

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Extra resources for An Introduction To the Logic of Psychological Measurement

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The structure is constituted by the proper­ ties of the relations involved. For example, the relation of being at least as long as has the properties of being transitive and strongly connected. What these terms 30 2. THE THEORY OF MEASUREMENT IN PSYCHOLOGY mean can be indicated more clearly if some symbols are used. Let. , "x", "y", "z", ... stand for entities in the class under consideration. y)" mean that x stands in the relation R to y. z). x). ) The properties that relations have cannot be taken for granted.

So, clearly, the concept (red) may be known even though the operation by which it is determined (seeing) ordinarily goes unrecognized. Even if this was not true, operationalism would still fail. For if in seeing that OPERATIONALISM 27 X is red, the concept of red is reducible to the operation of seeing, then the concept of red would be indistinguishable from that of blue, or any other visible quality. They, likewise, would be completely defined by exactly the same opera­ tion. In so linking concepts to the operation of seeing them, the operationalist arrives at a position not unlike Berkeley’s subjective idealism.

Bridgman’s principle, if taken seriously, makes all concepts, and all opera­ tions, unknowable. If the meaning of a concept is the set of operations by which it is determined, then knowing the meaning of the concept is dependent on knowing the appropriate set of operations. “Unless one knows the operations one does not know the meaning” (Bridgman, 1938, p. 116). However, recognizing, or knowing operations must in turn depend on knowing concepts. So which comes first, knowing concepts or knowing operations?

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