Educators use meta-analyses to decide best practices. It has been suggested that effect sizes have declined over time due to various biases. This study applies an established methodological framework to educational meta-analyses and finds that effect sizes have increased from 1970–present. Potential causes for this phenomenon are discussed.
"Longitudinal Stability of Effect Sizes in Education Research,"
Journal of Modern Applied Statistical Methods: Vol. 15
, Article 7.
Available at: http://digitalcommons.wayne.edu/jmasm/vol15/iss2/7