Sweating the small stuff in educational psychology: how effect size and power reporting failed to change from 1969 to 1999, and what that means for the future of changing practices¹

Methodologists have written for years about the importance of attending to important details in quantitative research, yet there has been little research investigating methodological practice in the social sciences. This study assessed the extent to which innovations and practices are adopted by researchers voluntarily. In particular, I use the case of power analysis and effect size reporting as the primary example, but I also examine other...