Abstract
The orthogonal rotation method of Kashiwagi (1965) as an objectification of the graphical factor rotation was extended to the oblique reference-axes method. First of all, the basic notions concerning the oblique factor rotation were discussed after reviewing the recent development. Secondly, the principle of the oblique reference-axes method of Thurstone (1947) was reviewed, and, thirdly, a proposal for the oblique reference-axes method based on the minimization of the maximum values of the absolute errors (MINIMAX) and of the sum of them (ABSMIN) was made. The orthogonal factor rotation as its special case was discussed after explaining the computational procedure together with the numerical examples based on the data of Thurstone's 20 box problem and of Harmen's 24 psychological tests.
