16PF-E Structure using Radial Parcels Versus Items

The Sixteen Personality Factor Questionnaire (16PF) was factored with the use of groups of items called radial parcels and was subsequently compared with an item factoring of the same data. This was done in order to verify the 16PF (Form E) primary factors and to investigate the use of radial parcels in that process. Ss were 449 physically or mentally handicapped men and women who were part of a rehabilitation counseling process. Results indicated that with some familiar exceptions factor identification and verification were complete. Moreover, the use of radial parcels maintained the dimensionality found in the items. Also, rotation toward simple structure proceeded more rapidly with parcels than with items.