Cohen, Jacob

Jacob Cohen was a prominent psychologist and statistician known for his work in research methodology. He introduced the concept of effect size, helping researchers understand the magnitude of differences or relationships in studies beyond just statistical significance. Cohen also developed guidelines for interpreting effect sizes as small, medium, or large, and emphasized the importance of assessing practical significance in research findings. His contributions have been fundamental in improving how scientific results are interpreted, ensuring that findings are meaningful and not just statistically significant.