“How many participants do I need?” is the question every thesis supervisor, ethics committee, and journal reviewer asks — and most students answer it with a shrug and a round number like 100. There is a better way. G*Power is a free program that tells you exactly how many participants your study needs before you …
Cohen’s d: A Measure of Effect Size in Research In research, especially in fields like psychology and social sciences, understanding the magnitude of differences between groups is essential. Cohen’s d is a statistical measure used to quantify the effect size, or the strength of a relationship or difference, between two means in a study. Unlike …
Cohen’s f: A Measure of Effect Size in ANOVA In research, when comparing more than two groups, researchers often use Analysis of Variance (ANOVA) to test whether there are statistically significant differences among the groups. Cohen’s f is a measure of effect size used in ANOVA to determine the strength of the differences between multiple …