A 2019 paper in the Advances in Methods and Practices in Psychological Science found that most psychology textbooks, instructors, and students misinterpret ‘statistical significance’ and p values. Talk about a headline! More important than the headline, however, are the right interpretations and what we can do to correct widespread misinterpretations. In this post, I explain what the authors’ findings and the three solutions they propose.
I decided to explain all of this on Twitter. I’ll include the entire thread below. (Don’t worry. It’s not a Tweetstorm. It’s just 5 tweets. And there’s no moral outrage involved.
So that’s it. It seems like a pretty big and complicated problem. But Cassidy and colleagues do a pretty good job of sorting out the problem, quantifying it, and offering some reasonable solutions. Now for the hard part: implementing the solutions. It’s going to take more than an academic paper and a Twitter thread to course correct our discussions of ‘statistical significance’ and p values. Indeed, it will take lots of action from lots of people—textbook authors, methodological instructors, etc. Solutions that require widespread action are often difficult to achieve—but collective action problems are a topic of another post for another day.