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Update, 12 October 2015: Since this story was first published, several researchers have criticized the study’s methods. Some statisticians, including Andrew Gelman, at Columbia University in New York, have said that the study incorrectly presented its results as statistically significant. Study co-author Tuck Ngun, of the University of California, Los Angeles, has disputed this and other statistical criticisms, although he has acknowledged another criticism that his study wasunderpowered. He has not yet made the full details of his analysis available, but has said he and his collaborators will issue a statement.
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