NeurIPS 2021 re-review flipped 23% of decisions; only ~1/3 of claims overlap

JessicaHullman · x · 2026-10-30

Quantifying the lottery variance of peer review: the NeurIPS 2021 experiment saw 23% of papers flip decisions on re-review. A deeper claim-level analysis finds only 1/3 of claims appear across the committee, showing coverage is highly fragmented. Reviewers also err — among directly checkable claims, the paper refutes the criticism 18% of the time.

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