Each study's plan and analysis code were hashed and sealed as a GitLab Release before its data was fetched. The verdict comes from the sealed code, run once, and is stored as a second Release.
| Study | Sealed (UTC) and hash | Verdict |
|---|---|---|
0001-penguin-flipper-sexAre male penguins' flippers longer than female penguins'? Prior look: Demonstration study. The author computed this comparison on the full dataset before writing the plan, so the verdict shows how the pipeline works and is not independent evidence. | 2026-10-16 09:01:37e2735cc76fe4721a | Evidence of an effect (pre-registered test) effect 7.14, 95% CI [4.45, 10.1], p = 1.53e-06, n = 165 / 168 (needed 124) |
0002-adelie-bill-islandDo Adelie penguins on Dream and Torgersen islands differ in bill length? Prior look: Demonstration study. The author computed this comparison on the full dataset before writing the plan, so the verdict shows how the pipeline works and is not independent evidence. | 2026-10-16 09:01:38da505aedabbe350e | No evidence of an effect at the planned sample size effect -0.449, 95% CI [-1.47, 0.594], p = 0.403, n = 51 / 56 (needed 51) |
0003-gentoo-mass-yearWere Gentoo penguins heavier in 2009 than in 2007? Prior look: Demonstration study. The author computed this comparison on the full dataset before writing the plan, so the verdict shows how the pipeline works and is not independent evidence. | 2026-10-16 09:01:40aed1cc95f0a02aa9 | Inconclusive: the sample is smaller than the plan requires effect 70.1, 95% CI [-164, 306], p = 0.556, n = 34 / 43 (needed 393) |
0004-chinstrap-adelie-flipperDo Chinstrap penguins have longer flippers than Adelie penguins? Prior look: The issue author has seen summary plots of flipper length by species in tutorials, so the direction of the difference is not a secret. The author has not computed this comparison or seen its numbers. The plan author did not open the data. | 2026-10-16 09:23:5252ebf9785e1ca1e6 | Evidence of an effect (pre-registered test) effect 5.87, 95% CI [3.88, 7.93], p = 7.45e-09, n = 151 / 68 (needed 31) |
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