title: Methods for evaluating changes in health care policy: the difference-in-differences approach.
authors.affiliation: The Center for Healthcare Outcomes and Policy, University of Michigan, Ann Arbor2Institute for Healthcare Policy and Innovation, University of Michigan, Ann Arbor3Department of Surgery, School of Medicine, University of Michigan, Ann Arbor4Department of H.
authors.forename: Justin B
authors.initials: JB
authors.lastname: Dimick
authors.affiliation: The Center for Healthcare Outcomes and Policy, University of Michigan, Ann Arbor2Institute for Healthcare Policy and Innovation, University of Michigan, Ann Arbor4Department of Health Policy & Management, School of Public Health, University of Michigan, A.
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Ryan
mesh_terms: D003627:Data Interpretation, Statistical; D006291:Health Policy; D017063:Outcome Assessment, Health Care / Q000379:methods*; D011050:Policy Making; D012107:Research Design