/**
 * Abramowitz & Stegun 7.1.26 rational approximation of the error function.
 * Max absolute error ~1.5e-7 — ample for p-value gating.
 */
export declare function errorFunction(value: number): number;
/** Standard normal cumulative distribution function Φ(value). */
export declare function normalCdf(value: number): number;
/** Linear-interpolation quantile of a pre-sorted array (`q` in [0, 1]). */
export declare function quantile(sorted: number[], q: number): number;
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