No Child Left Behind (NCLB) performance mandates, embedded within state accountability systems, focus school AYP (adequate yearly progress) compliance squarely on the percentage of students at or above proficient. The singular importance of this quantity for decision-making purposes has initiated extensive research into percent proficient as a…

In assessing the validity of a norm-referenced model used in evaluating large-scale federal educational programs for disadvantaged children, gain estimates were shown as approximately equal with randomized control group model estimates compared by retrospective analyses of two databases. (Author/CM)