Published online by Cambridge University Press: 01 January 2025
The choosing of a set of factors likely to correspond to the real psychological unitary traits in a situation usually reduces to finding a satisfactory rotation in a Thurstone centroid analysis. Seven principles, three of which are new, are described whereby rotation may be determined and/or judged. It is argued that the most fundamental is the principle of “parallel proportional profiles” or “simultaneous simple structure.” A mathematical proof of the uniqueness of determination by this means is attempted and equations are suggested for discovering the unique position.
Reyburn and Taylor (13) and others have sometimes spoken of an intermediate degree of reality. “If common factors are not causal they must at least be objective . . . [which requires] a certain form and degree of invariance” [namely, of factor loading of a test from battery to battery]. We should consider such factors to be in a transitory limbo, destined soon to emerge to one status or the other.
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