Scott Alexander, curated
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Two Unexpected Multiple Hypothesis Testing Problems

Quality
70
Strong
Claude Shift
52
Moderate
RWI
2
of 10

Summary

A sharp, honest exploration of two subtle multiple-comparisons puzzles. (1) The Vitamin-D-COVID trial where a randomization imbalance in blood pressure survives multiple-comparison correction but is still real and confounds the result — the deep point that correcting for multiple comparisons proves no malfeasance, but the real imbalance still ruins the causal inference, and every RCT that checks enough confounders eventually hits a 'significant' one. (2) His own ambidexterity-authoritarianism replication: the key insight that Bonferroni-style corrections are for INDEPENDENT hypotheses, but when you test the SAME hypothesis multiple ways, the tests can make each other MORE credible (replicating a true result a hundred times shouldn't turn it false). He works through Bayesian framing (treating each NHST as a Bayes factor), finds it unsatisfying (a null result 'can only do nothing'), and honestly hits the limits of his stats knowledge.

Why this score

Quality 70 · Strong. Strong: a genuinely sharp, generative treatment of an underappreciated statistics problem (same-hypothesis-multiple-ways vs independent-hypotheses; the surviving-real-imbalance point), intellectually honest about its unresolved parts; held mid-Strong by brevity and inconclusiveness.

Claude’s paradigm shift 52 · Moderate. Notable: the 'multiple-comparison correction can't fix a real imbalance' and 'replicating shouldn't make a result false' points are a fresh, non-obvious sharpening of standard stats intuitions.

Real-world impact 2 · Minor. Within-discourse: a useful epistemics/methodology reframe for numerate readers; no material reach.