1. CattellRaymond B., and SticeGlen F.: Handbook for the Sixteen Personality Factor Questionnaire. Illinois: The Institute for Personality and Ability Testing, 1957. pp. 53. The author reports a split-half reliability ranging from .71 to .93 for the sixteen factors. Since the test is based upon factorial methods, Cattell considers its validity to be the equivalent of construct or concept validity. As estimated from the loadings on the sixteen factors, the validity ranges from .76 to .96. In addition, when validity is regarded as the square root of the reliability, the range for the factors is from .84 to .96.
2. LurieAbraham: Unpublished dissertation, New York University, Criteria for Social Rehabilitation of Discharged Psychiatric Patients, p. 56.