... informally interpret a Rorschach or MMPI profile, or they may be combined formally, as when we put the scores into a multiple regression equation. Nonpsycho-metric data may be combined informally, ... done properly. If the empirical comparisons had consistently favored informal judgment, we would have considerable explaining to do. Yet the empirical comparisons were necessary, as we see ... of prediction is informal, nonactuarial combining of psychometric and nonpsychometric data. (The erroneous notion that nonpsychometric data, being “qualitative,” preclude formal data combination...