The development of a validity scale for the clinical analysis questionnaire
Krug, S. E. (1979). The Development of a Validity Scale for the Clinical Analysis Questionnaire. Multivariate Experimental Clinical Research, 4(4), 125-131.
Following the procedures similar to those used by the MMPI authors in the development of the F (validity) scale, a self-contained validity index was developed from the item pool of the Clinical Analysis Questionnaire (CAQ). Ten (10) items were found to have very infrequently endorsed alternatives in a derivation sample of 300 normal college students. These were checked in an independent sample of 200 college students and in a sample of 200 clinically diagnosed adults, all of whom were tested as part of the test's standardization. The resulting scale effectively differentiated acceptable from randomly generated profiles with a satisfactorily high level of validity (.61) and classification accuracy (83%), yet did not differentiate normal from clinical profiles, as is frequently the case with F. Because of its brevity and convenience, it is likely to become an important element of the CAQ profile and provide the examiner with valuable evidence on test-taking attitude.