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Replication Reveals Smaller, Fewer Effects
- A large replication project retried 100 psychology studies and only ~1/3 replicated with significant results.
- Mean effect sizes in successful replications were roughly half those reported originally.
Treat Single Replications With Caution
- Failed replications don't automatically prove original findings false, but they reduce confidence until multiple attempts converge.
- Binary significance thresholds (p<.05) can misleadingly categorize near-identical outcomes as success or failure.
Replicate And Publish Negative Results
- Researchers should attempt to replicate their own findings and publish null or failed replications.
- Journals and incentives must shift to reward replications and reporting negative results.