The purpose of this ex post facto study was to compare the effect the Read Well and the Reading Street curriculums had on achievement test scores. Data from the "Stanford Achievement Test, 10th ed." (SAT10) were examined using total reading scale scores for males and females at the kindergarten and first- and second-grade levels. Three…

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"…