Product
Mei-Vald Index
MAY-vahld
The clear authority, isolated.
明 Mei — Japanese, “clear, bright”+Vald — Old Norse, “power, authority”
An adjusted plus-minus engine that isolates individual player impact from teammates, opponents, and lineup context — signal the box score can't see.
Decision support for coaches, not decision authority: a real-time deterministic rating in place of manual spreadsheet review for rotation decisions.
What’s inside
The model
Sparse linear formulation: Yᵢ = β₀ + Σ(Team A βⱼ) − Σ(Team B βₖ) + γ_rot(i) + ε — isolates latent skill from rotational leverage
L2-regularized ridge solve — (XᵀX + λI)⁻¹XᵀY — handles the multicollinearity that synchronized substitutions create
Real-time, not end-of-season
Consumes Kai-Dom Engine's own hash-chained rally log directly — no separate data pipeline to keep honest
Displays as both a raw adjusted rating and an ELO-style MMR number
Scope, stated honestly
Heatmapping and ball-pathing are credited in the spec but not yet buildable — they need real per-touch x/y court coordinates the current token schema doesn't capture