Defense Date
2024
Document Type
Thesis
Degree Name
Master of Science
Department
Clinical Psychology
First Advisor
Dr. Jared Keeley
Abstract
Invalid responding is a significant issue in the utilization of self-report information. Invalid responding can be assessed by stand-alone validity measures or embedded validity scales. The International Classification of Diseases (ICD) is one of two major diagnostic systems which provide guidance on diagnosing personality disorder, with the most recent version (ICD-11) providing a fully dimensional model for personality disorders. No existing measures aimed at assessing dimensional personality pathology have addressed the combination of PD severity and trait qualifiers that were based upon ICD-11 guidelines. To address this gap, Clark et al. (2021) developed the ICD-11 Personality Disorder Measure (PSI-11). However, Clark et al. (2021) did not include any embedded measure of response validity in the PSI-11. Therefore, the aim of the proposed study was to construct a PSI-11 inconsistency scale. The study utilized previously collected data of 341 participants recruited through MTurk. The validity scale was constructed using item-to-item correlations to identify item-pairs, and then discriminant function analyses were employed. A total of 68 item pairs were identified. Analyses revealed an optimal cutpoint of 65, with a sensitivity of .997 and specificity of .997 when amounts of real and random data are equal. The Balanced Inventory of Desirable Responding Short Form (BIDR-16) and an inconsistency scale for the Personality Inventory for DSM-5 (PID-5) were utilized as external validators for the developed inconsistency scale. Overall, this study’s developed inconsistency scale performed well and holds promise for future research and clinical application in the detection of inconsistent responding on the PSI-11.
Rights
© Rae Lutz
Is Part Of
VCU University Archives
Is Part Of
VCU Theses and Dissertations
Date of Submission
5-8-2024