“Parallel proportional profiles” and other principles for determining the choice of factors by rotation

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.     

Confirmation and clarification of primary personality factors

In connection with a study bridging rating, questionnaire, and objective test factors, confirmation was sought with respect to the twelve personality factors previously found for young adult men. Variables were chosen to clarify and discriminate the nature of related factors. Ratings of and by 373 students were obtained, and the present study describes the separate factorization for the 133 men among them. Factorization yielded eleven factors, of which, on blind rotation for simple structure, 9 or 10 proved to be identical with those of the previous study. A new factorM is described.