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Elemental Showdown: the scoring function (#161) - #172
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One pure function turns a Matchup's count, sum(value) and sum(value²) into the numbers the reveal, the Stats, the Stories and Matchup selection all read: its Effectiveness from the lower-id Element's side, its Confidence, the shrunk mean Vote, the polarisation and the selection weight. The Dirichlet-multinomial posterior behind them, the prior, the cuts and the verdict gate live here by name and nowhere else. A Matchup nobody has voted on needs no special case: the prior alone scores it as faint Neutral. Mirroring turns the lower-id Element's call into the higher-id one's, and the headline reads the Voter's own Vote against the crowd's step once the Matchup has enough Votes to have one. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01AVEtgjCoEbaNHrYfzyCRNH
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Closes #161. Part of #158.
scoreMatchupturns a Matchup's three sums (count,sum(value),sum(value²)) into a typed score: Effectiveness, Confidence, the shrunk meanm, polarisationPand the selection weight, with the prior and every cut as a named constant.mirrorEffectivenessreads a call from the higher-id Element's side, andheadlineForgives the reveal's headline kind for a Voter's Vote. Pure and browser-safe; zero Votes score as faint Neutral from the prior alone.Verification
Pure tests on both sides of every cut (
|m|at 0.5 and 1.5,Pat 0.6,hat 0.25 and 0.5) using crowds built from real Votes so the sums cannot disagree, plus the headline at 1, 4 and 5 Votes and at distances 0, 1 and 2.bun run checkandbun run testgreen.🤖 Generated with Claude Code
https://claude.ai/code/session_01AVEtgjCoEbaNHrYfzyCRNH