Effect Size Matters

By

Paul D. Ellis

“Your book rocked my little statistical world.”

Is your study worth doing? Do your results make sense?

In this jargon-free introduction to effect sizes, you will learn how to answer the toughest questions you will ever hear in a research seminar: “So what? What does this study mean for the world?”

If you want to know;

• five compelling reasons to report effect sizes
  
• which journal editors are insisting authors report effect sizes and why
  
• how to calculate effect sizes in a variety of metrics
  
• the difference between statistical- and substantive significance
  
• how to interpret your results in a way that makes sense to nonspecialists
  
• why small effects can sometimes have big consequences
  

then this is the book for you!