A DIMENSIONAL ANALYSIS OF MMPI ITEMS

A method of analysis specifically designed for binary data was applied to 100 MMPI items. Sixty, items were carefully chosen to represent the nine major clinical scales with respect to direction of keying, social desirability scale value and endorsement frequency. The remaining 40 items were randomly chosen from items not appearing on any of these scales. Although a complete solution was obtained in five dimensions, only three were retained. The three dimensions were related to scale membership, gender of the respondent and various item characteristics. The results clearly support the two major MMPI factors obtained on a scale level and additionally show a strong gender dimension.