title: Introduction to special section: quantitative methods.
authors.affiliation: Outcomes Research, Evidera, 7101 Wisconsin Ave., Suite 1400, Bethesda, MD, 201814, USA, dennis.revicki@evidera.com.
authors.forename: Dennis A
authors.initials: DA
authors.lastname: Revicki
authors.forename: Carolyn E
authors.initials: CE
authors.lastname: Schwartz
mesh_terms: D006304:Health Status; D006801:Humans; D011594:Psychometrics / Q000379:methods*; D011788:Quality of Life