An analysis of the factors in a typical test of introversion-extroversion.

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Abstract
A typical test of introversion-extroversion of the Yes-No variety was prepared after a survey of the literature on the subject and of the tests now in use. The test was given to 930 students, 277 of whom repeated it after an interval of a month. The frequency with which every one of the 36 was responded to in a certain way in conjunction with a certain response to every other item was obtained. From these were obtained coefficients of contingency between pairs of items, which when corrected gave equivalent Pearson coefficients of correlation. By means of the Spearman-Dodd technique, the correlation of each item with an assumed g factor was obtained, and also the corresponding weight for each item. Thurstone's method of multiple-factor analysis was applied to the table of intercorrelations and at least 18 group factors were found to be present. The four most important were: (1) a tendency to fear the environment, to shrink away from it; (2) an emotional sensitiveness to the environment; (3) impulsiveness; and (4) interest in self. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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