Methodological and quantitative issues in the study of personality pathology.

This special issue presents 12 invited articles on quantitative and methodological issues of particular importance in the study of personality disorders (PDs). The special issue includes manuscripts on issues related to open science (i.e., registration continuum), sampling practices, concerns with the application of PD research and diagnoses to minoritized populations, best practices for addressing comorbidity and heterogeneity, aligning experimental, behavioral tasks used in PD work with Research Domain Criteria constructs, studying PDs using ecological momentary assessment, as well as other longitudinal approaches. Additional manuscripts cover the need to think carefully about response validity in data collection, recommendations for the ongoing use of factor analysis, concerns and recommendations for the search for elusive and typically underpowered moderators, and a review of the clinical trial literature as it relates to PDs. (PsycInfo Database Record (c) 2023 APA, all rights reserved).