How is draft board accuracy measured?
By rank correlation: how closely a board's pre-draft order matched the order players actually turned out in, scored on classes the model never trained on.
A board is a ranking, so grading one means asking how well its order matched reality's order. That is a rank correlation — Spearman's, specifically. One means the board got the sequence exactly right; zero means it did no better than shuffling.
Draftanomics currently withholds its career-model rank-correlation claim. The earlier folds did not enforce when five-season labels became observable, and the corrected window has too few eligible classes.
The withdrawn numbers remain in the audit artifact for reproducibility, not as current evidence. Realized Career Score regrades remain descriptive history.
Measured on drafted players only. Our historical classes are built from draft results, so these figures describe ordering players who were drafted — not the separate question of who gets drafted at all. All three boards are scored on the same 826 players, so the comparison between them is like-for-like.