In the present study, we investigated the relative impact of age- versus schooling-related growth in school readiness skills using four modeling approaches that leverage natural variation in longitudinal data collected within the preschool year. Our goal was to demonstrate the applicability of different analytic techniques that do not rely on…

Assessed the reading and mathematics abilities of kindergartners and first graders in the fall and spring of the school year. Found that younger first graders made as much progress over the year as older first graders and more than older kindergartners. Findings demonstrated that entrance age was not a good predictor of learning or academic risk.…