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We replicated 21 social science experiments in Science or Nature. We succeeded with 13. Replication effect sizes were half of originals. All materials, data, code, & reports: osf.io/pfdyw/, preprint socarxiv.org/4hmb6/, Nature Human Behavior nature.com/articles/s4156…
Using prediction markets we found that researchers were very accurate in predicting which studies would replicate and which would not. (blue=successful replications; yellow=failed replications; x-axis=market closing price) socarxiv.org/4hmb6/ nature.com/articles/s4156… #SSRP
Design ensured 90% power to detect an effect size half as large as original study. Replications averaged 5x the sample size of originals. We obtained original materials in all but one case, and original authors provided very helpful feedback on design. socarxiv.org/4hmb6/
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