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A meta-analysis of research on grade retention, C.T.Holmes a review of research on kindergarten retention, L.A.Shepard academic and emotional effects of kindergarten in one school district, L.A.Shepard and M.L.Smith attitudes of parents, students and educators toward repeating a grade, D.Byrnes teachers' beliefs about retention, M.L.Smith ending school promotion in Waterford - appearance and reality, M.C.Ellwein and G.V.Glass repeating and dropping out of school, J.Grissom and L.A.Shepard alternatives to student retention - new images of the learner, the teacher and classroom learning, P.L.Peterson policy implications of retention research, E.House.
Wilson et al. (Mon,) studied this question.