Analysis of Nominally Equivalent Outcome Studies: A Comment on Rickles, Heppen, Allensworth, Sorensen, and Walters (2018)

Rickles, Heppen, Allensworth, Sorensen, and Walters (2018) compare two credit recovery programs with a null hypothesis of equal effects. Upon failing to reject the null, they implicitly accept the null. However, not rejecting the null is not equivalent to accepting the null, a confusion common to a range of research, which I highlight