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Briggs, Derek C.; Weeks, Jonathan P. – Educational Measurement: Issues and Practice, 2009
Most growth models implicitly assume that test scores have been vertically scaled. What may not be widely appreciated are the different choices that must be made when creating a vertical score scale. In this paper empirical patterns of growth in student achievement are compared as a function of different approaches to creating a vertical scale.…
Descriptors: Scaling, Models, Longitudinal Studies, Academic Achievement