OMbook_glossary AllABCDEFGHIJKLMNOPQRSTUVWXYZ Y Youden's index Also known as Youden's J statistic or Peirce Skill Score (PSS), Hanssen–Kuipers Discriminant (HKD), or... More→ YP-CORE Ten item self-report questionnaire designed for measurement of change in therapies for young people (aged... More→