Detection of Random Responding on the MMPI-2: Utility of F, Back F, and VRIN Scales

The validity of the MMPI-2 F, back F, and variable response inconsistency scales for detecting random responding was evaluated in 180 college students. Five partially valid groups completed initial blocks of questions (100, 200, 300, 400, & 500) under standard instructions prior to having their test booklets removed and randomly responding to the remaining questions on the answer sheet. Additionally, an all-valid group completed the entire test under standard instructions, and an all-random group completed the entire answer sheet without access to the test booklet. All 3 indexes were sensitive to the presence of random responding. A regression equation was developed for their combined use in detection of random responding. Additionally, the hit rates, sensitivity, and specificity of each index used alone to detect random responding are presented.