prep: An agony in five Fits

In 2005 Psychological Science, the flagship journal of the Association for Psychological Science, began their current practice of asking contributors to compute the statistic prep in lieu of the traditional p-value. In a polemic comprising five Fits we argue that prep is misnamed, commonly miscalculated, misapplied outside a narrow scope, and its large variability often produces values that invite mistrust and mislead the interpretation of data.