Effect size is a statistical measure that quantifies ‘how much of an impact’ one thing has on another. Two common measures of effect size are Cohen’s d and Hedges g. They are both very similar, and you can compare them.
Shaun Killian is an experienced teacher and principal with a passion for helping students to excel. He believes that assisting teachers to adopt evidence-based education is the best way to make this happen. Shaun is committed to bringing you practical advice based on solid research.