Fp-R (Infrequency-Psychopathology-Revised)
Definition
MMPI-2-RF over-reporting validity scale measuring endorsement of items rarely endorsed even by genuine psychiatric patients; stronger malingering indicator than F-r in forensic inpatient settings.
- Instrument
- MMPI-2-RF validity scale
- Measures
- Over-reporting of rare psychopathology items
- Setting strength
- Forensic inpatient malingering detection
- Compared to
- Stronger indicator than F-r in that setting
Common questions
Why is Fp-r considered stronger than F-r specifically in forensic inpatient settings?+
Fp-r items were selected because they are rarely endorsed even by people with genuine, severe psychiatric symptoms, whereas F-r items include some content that genuinely psychotic or severely disturbed inpatients may legitimately endorse, making Fp-r more resistant to false positives in that population.
What does an elevated Fp-r score suggest about how to interpret the rest of the MMPI-2-RF profile?+
An elevated Fp-r raises concern that the respondent is exaggerating or fabricating psychiatric symptoms, which means the clinical scales on the same profile become less interpretable at face value and should be weighed cautiously alongside other malingering indicators before drawing conclusions.
Can a genuinely psychotic patient still score high on Fp-r?+
It is possible but less likely than on F-r, since Fp-r's item pool was specifically screened against genuine clinical populations, which is why forensic evaluators still consider case context and corroborating evidence rather than relying on Fp-r alone.
Related terms
- ANT (Antisocial Features)
- PAI clinical scale with three subscales (Antisocial Behaviors, Egocentricity, Stimulus Seeking); correlates substantially with PCL-R scores in forensic samples.
- Base Rate (BR) Scoring
- MCMI-IV scoring system that replaces T-scores with prevalence-adjusted scores; BR 75 indicates trait elevation, BR 85 supports diagnostic inference.
- F-R (Infrequency-Revised)
- MMPI-2-RF over-reporting validity scale measuring endorsement of rare psychological content; elevation above T=80 raises concern about symptom exaggeration.
- FBS-R (Symptom Validity Scale-Revised)
- MMPI-2-RF scale developed to detect over-reported somatic and cognitive symptoms in personal-injury litigation; contested validity in traumatically injured genuine plaintiffs.
- L-R / K-R
- MMPI-2-RF under-reporting validity scales; L-r (Uncommon Virtues) and K-r (Adjustment Validity) detect unrealistically positive self-presentation.
- MAL (Malingering Index)
- PAI configuration-based supplementary index developed for forensic populations to detect feigned psychopathology; used alongside NIM and clinical scales.
- MCMI-IV
- Millon Clinical Multiaxial Inventory, Fourth Edition; 195-item instrument with base-rate scoring, aligned with DSM-5 personality disorder criteria.
- MMPI-2-RF
- Minnesota Multiphasic Personality Inventory-2-Restructured Form; 338-item self-report instrument with 51 scales, the most researched personality measure in forensic psychology.
- NIM (Negative Impression Management)
- PAI primary over-reporting validity scale; T-scores above 73 typically raise concern about feigned psychopathology in forensic evaluations.
- PAI
- Personality Assessment Inventory; 344-item instrument with 22 non-overlapping scales, built on construct-validation strategy; NIM and supplementary indices detect over-reporting.
- RBS (Response Bias Scale)
- MMPI-2-RF supplementary validity scale predicting performance validity test failure; developed specifically to detect self-reported memory complaints inconsistent with objective testing.