![]() ![]() The search for a scientific way to describe personality traits goes back at least to the 1930s. He's challenging the uniqueness of grit, and therefore its usefulness as an object of research. This one is in some ways Crede's biggest. The cover blurb on Duckworth's book by Daniel Gilbert, author of Stumbling on Happiness, states, "Psychologists have spent decades searching for the secret of success, but Duckworth is the one who found it." It wasn't good looks, physical health, and it wasn't IQ. This would seem to be at odds with previous statements by Duckworth, such as in her 2013 TED talk, when she presents grit as a powerful, even unique factor: "One characteristic emerged as a significant predictor of success. She says her findings of the independent impact of grit are what personality psychologists would put in the "small-to-medium" range. This compares to a much higher correlation of 0.50 between, say, SAT scores and performance in college.ĭuckworth's own numbers, in a paper published in 2007, are only slightly higher: 0.20.įundamentally, she told NPR Ed, she doesn't disagree with Crede here either. but again, the tables and statistics are entirely correct, and the intent was not to mislead!"Ĭrede's paper calls the relationship between grit and academic success "only modest." His analysis found an overall correlation of 0.18, looking at papers by Duckworth and others. The correct numbers are clear from the charts and tables in the original paper.ĭuckworth, in an email, agreed with the critique. "Cadets who scored a standard deviation higher than average on the Grit–S were 99% more likely to complete summer training," the paper says. The paper stated that grit was highly predictive of the likelihood of making it through "Beast Barracks," or basic training. In a 2009 paper, she and co-author Patrick Quinn famously looked at answers by West Point cadets on an eight-item version of her "grit scale." ![]() 1, Duckworth admits to the charge of badly describing the size of her outcomes. It is not something that's necessarily open to change, especially in adults, whereas Duckworth in her writings suggests that grit is. Grit is nearly identical to conscientiousness, which has been known to psychologists for decades as a major dimension of personality.The impact of grit is exaggerated, especially when looking at broader populations of people - not just the high achievers in Duckworth's initial studies.Effect sizes in one of Duckworth's major papers on grit were described incorrectly to sound misleadingly large.Here are the key claims in Crede's paper: ![]()
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