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Download full textLee, Jaekyung; Finn, Jeremy; Liu, Xiaoyan – Online Submission, 2011
Through a synthesis of test publisher norms and national longitudinal datasets, this study provides new national norms of academic growth in K-12 reading and math that can be used to reinterpret conventional effect sizes in time units. We propose d' a time-indexed effect size metric to estimate how long it would take for an "untreated"…
Descriptors: Control Groups, National Norms, Effect Size, Mathematics Education
