evalstats: Bootstrap CIs Worst Offender, Under-Covering and Overconfident at Small Samples

IanArawjo · x · 2026-09-04

Ian Arawjo shared the TLDR of his evalstats project: across the board, the CI methods HCI researchers typically reach for frequently under-cover and are overconfident at the small samples their studies use — with bootstrap CIs being the worst offenders.

Related event: Study Finds Confidence Interval Methods Unreliable for Small-Sample AI Evaluation(2 posts)→

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