A Solution to Psychology’s Reproducibility Problem Just Failed Its First Test

“Preregistration is not as easy as it may seem,” says Aline Claesen, a psychologist at the Catholic University of Leuven (KU Leuven) in Belgium. She and her colleagues examined 27 preregistration plans filed by psychologists from February 2015, when the journal Psychological Science started to offer badges for preregistered studies, to November 2017. In every case, her team reports this month in a preprint on the PsyArXiv server, the researchers deviated from their plan — and in every paper but one, they did not fully disclose these deviations.

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