Paul Meehl and the evolution of statistical methods in psychology

In his landmark 1978 paper, Paul Meehl delineated, with remarkable clarity, some fundamental challenges facing soft psychology as it attempts to test theory with data. In the quarter century that followed, Meehl’s views stimulated much debate and progress, while continually evolving to keep pace with that progress. This paper pays homage to Meehl’s prescience, and traces the impact of his ideas on the recent shift of emphasis away from hypothesis testing and toward confidence interval estimates of effect size.