We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleEstablishing equivalence: methodological progress in group-matching design and analysis.AuthorsKover ST; Atwoo AKPublicationAmerican journal on intellectual and developmental disabilities, 2013, Vol 118, Issue 1, p3ISSN1944-7515Publication typearticleDOI10.1352/1944-7558-118.1.3