AI article
Fitting one score across 40 sparse benchmarks with item response theory
Community description: How we replaced an averaged composite with a 2PL item response model: the fitting choices, the single-board trap, uncertainty ranges, a scale we had to reverse, and what we validated.
Dev.to | Oct 9, 2026 | Alex Fank
Automated excerpt
Part 1 described how our averaged composite failed: a model measured on three saturated legacy boards outranked flagships measured across eighteen, because hard boards lower a mean and easy boards raise it. Models that share no board also become comparable. The figure shows four boards with their fitted reference parameters.
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