RERUN
Claim 33

Receipt for run 1: the Lab's permanent record of what it did

Do small classes help young children learn?

RERUNCLAIM #0033

Do small classes help young children learn?

Measured in
percentile points
Paper says
8.57
Counts if
8.32 to 8.82
Lab got
8.5152
VerdictNumbers check out
9dec5a93332271dd854aNov 07, 2026

Paper said 8.57. We got 8.5152.

The code and data produced the same result. That doesn't prove the study's method is right.

Check this yourself

You don't have to trust us or the . With Docker and Node installed, this retraces the claim on your own computer and compares the number:

git clone <this repository> && cd rerun && pnpm install && pnpm sandbox:build
pnpm verify-claim 33

How much evidence is behind this?

Each step is a tougher test. Only the first one decides who wins the market.

  1. 1. ✓

    The Lab's retrace of the code and data named in the claim

    The Lab retraced the code and data and got a number inside the claim's range. YES wins.

  2. 2. –

    Stress test: does the number depend on luck?

    Fetching the extra runs…

  3. 3. –

    Rebuilt from the description (experimental)

    Fetching the AI's rebuild…

Coming next: a data-leakage check, for the same rows in training and test data, and a maths check on the statistics a paper reports. Neither has run on this claim.

Even all three steps can't prove the science is true. They show how well this result stands up to checking.

Verified

Your browser just re-checked these itself, so you don't have to trust this site.

Checking…

The write-up

The write-up isn't available right now. Its fingerprint is below.

The full record (technical)

✓ Verified on NEAR. See the contract's history

Outcome
REPRODUCED
9dec5a93332271dd854ae721e75ba32855be56a09e8781adaa1407fec5f90597
Commit
175eddea88cc8adab8dd20f2100b5b453d359244
Data fingerprints
0e8b179ea3d883730b25008ca1293c4c8f886aa8d5d299c03ab6ff05d0123ae6
Software versions fingerprint
8dab88328537f15c219ff04f4c55b0150f9867347067f4b5868ed8b0769249af
Runtime
1s, exit code 0
Started, finished
11/7/2026, 6:22:47 AM, 11/7/2026, 6:23:47 AM
Lab
rerun-lab-43f5f2.testnet
Lab code fingerprint
49fabb2e2f141c064ca032b253ce0f7e4f8054a781e5b3d64ee0d8a238372802
AI used
z-ai/glm-5.3-flash
d3ef44767a10ebd9e6ddc0250017459723b9048e24ea26773008c0fe119823a3
Signed AI replies
c52090cdfc8f4005a6a5d9dc39b5ea72
Log fingerprint
bdcf96b98f2be1cebb105c16dd75ab3867c15b1ed6d9d2554d26e71cd097683e
Write-up fingerprint
c809f67fe3273d479edebd45c0ce02978540f2d4605d6c227996031e2206d010
Show the end of the run log
grade k children 5786 paper 4.82 rebuild 4.93
grade 1 children 6379 paper 8.57 rebuild 8.52
grade 2 children 6049 paper 5.93 rebuild 5.95
grade 3 children 5967 paper 5.32 rebuild 5.68
first_grade_gap 8.5152