Psychometric Properties of the MMPI-A Harris-Lingoes and Si Subscales in a Forensic Sample

The purpose of the current study was to examine the internal and external psychometric properties of the Harris-Lingoes subscales. This was accomplished by use of both self-report and caregiver-rated external criterion measures. The present study employed an archival data set consisting of 760 adolescents (470 boys and 290 girls) who completed the MMPI-A at an outpatient adolescent treatment facility as part of a court-ordered psychological evaluation. Overall, a number of subscales demonstrated good internal consistency reliability (e.g., D4 and Hy3) whereas other subscales (e.g., Pd2) demonstrated unacceptable internal consistency reliability for both genders. Correlations with external self-report scores and caregiver ratings showed varying degrees of support for the construct validity of scores on the Harris-Lingoes and Si subscales in this sample. As a secondary analysis, stepwise regression was used to predict scores on the CBCL Internalizing and Externalizing scales. Limitations and directions for future research are discussed