Classification accuracy statistics confirmed the recommended cut scores in the MMPI-2 RF manual (Ben-Porath & Tellegen, 2008). No other validity scale added consistent incremental predictive utility to Infrequent Psychopathology Responses in distinguishing the simulation groups from the sample of patients. The MMPI-2 RF validity scale Infrequent Psychopathology Responses best differentiated the simulation groups from the sample of patients, regardless of experimental condition. We used an analogue, experimental simulation in which MMPI-2 RF responses (derived from archived MMPI-2 protocols) of undergraduate students instructed to overreport psychopathology (in either a coached or noncoached condition) were compared with those of psychiatric inpatients who completed the MMPI-2 under standardized instructions. This set of validity scales includes a newly developed scale and revised versions of the original MMPI-2 validity scales. We examined the utility of the validity scales on the recently released Minnesota Multiphasic Personality Inventory–2 Restructured Form (MMPI-2 RF Ben-Porath & Tellegen, 2008) to detect overreported psychopathology. Overall the results of both studies suggest that the ICN-SF can aid examiners in assessing for inconsistent responding. In study 2, PAI-SF scores from 627 forensic and civil inpatients produced similar results, effectively identifying cases with elevated scores on the full-form inconsistency scale. This cutoff correctly classified 92% of the random protocols and inaccurately classified 9% of the patient protocols in study 1. ICN-SF scores greater than 8 reasonably balanced sensitivity and specificity rates. Diagnostic efficiency statistics are reported using multiple cut-off scores at various base rate estimates. Total ICN-SF scores in both samples were significantly lower than scores obtained from computer-generated random samples. Psychometric properties of the ICN-SF total scores were comparable in the derivation and cross-validation samples. Ten correlated item pairs were identified using the derivation sample and placed on the ICN-SF. In Study 1, 503 inpatient profiles were randomly assigned to a derivation or cross-validation sample. The goal of this investigation was the development of an inconsistency scale (ICN-SF) for the personality assessment inventory-short form (PAI-SF).
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