Influential Dan Ariely Study Retracted Amid Data Manipulation Concerns
An influential 2002 study co-authored by Israeli behavioral economist Prof. Dan Ariely has been retracted by the journal Psychological Science. The retraction follows a failed replication attempt by Prof. Kyle Hyndman and Prof. Alberto Bisin, and a subsequent analysis by researchers at Data Colada (Uri Simonsohn, Joe Simmons, and Leif Nelson) that raised serious questions about the reliability of the original data. The initial paper, which examined procrastination and the effectiveness of different deadline structures, concluded that evenly spaced external deadlines improved performance more than self-imposed or single final deadlines. Data Colada's investigation identified several 'major red flags,' including unusually large effect sizes, duplicated observations, implausible statistical relationships, and inconsistent reporting of time spent on tasks, leading them to believe the data from one study had been 'severely tampered with or fabricated.' Prof. Ariely and Prof. Klaus Wertenbroch, the co-authors, a...