Shanker Blog » How Cross-Sectional Are Cross-Sectional Testing Data? - 0 views
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Jeff Bernstein on 07 Sep 11In several posts, I've complained about how, in our public discourse, we misinterpret changes in proficiency rates (or actual test scores) as "gains" or "progress," when they actually represent cohort changes-that is, they are performance snapshots for different groups of students who are potentially quite dissimilar.