Recently, NCES/ETS published a paper on public/private correlated data, "Comparing Private Schools and Public Schools Using Hierarchical Linear Modeling" (Braun, Jenkins, Grigg). It's an extremely technical paper, obviously intended for statisticians, given comments like, "And now I'll make it easier for you, here are the formula:..."
Shortly thereafter, there came along a refutation from Harvard Education Policy faculty, "On the Public-Private School Achievement Debate" (Peterson, Llaudet).
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