@chiasm agreed! A tough problem in science that meta analyses tend to aggravate is publication bias. https://detectingbadscience.wordpress.com/2024/09/29/publication-bias/
By averaging over studies that are more positive than all findings obtained (but not published), meta analyses only reinforce overly positive impressions of effect sizes. Pre-registered replications tend to reveal that actual effects are only half as strong as the original studies
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