/**
 * Paired-comparison statistics for cross-run reports: an exact two-sided sign
 * test over paired outcomes, and a seeded bootstrap confidence interval for a
 * paired mean delta.
 *
 * Both are distribution-free on purpose. A benchmark run yields few paired
 * trials (single digits to low tens), the per-trial deltas are integers with
 * long tails, and the question is "on the same case, did B beat A" — which a
 * paired sign test answers exactly, without a normality or symmetry assumption
 * the data cannot support. Ties carry no sign and drop out of the test, as the
 * sign test requires.
 *
 * The bootstrap resamples the observed deltas with replacement, so its interval
 * needs no shape assumption either, and it is seeded so that re-running
 * `compare` on the same reports prints a byte-identical table.
 *
 * @module dsh-eval/stats
 */
/** Outcome of an exact two-sided sign test. */
export interface SignTestOutcome {
    /** Discordant pairs (`wins + losses`); ties drop out of the test. */
    discordant: number;
    /** Exact two-sided p-value; 1 when every pair tied. */
    pValue: number;
}
/** A paired mean delta with its bootstrap interval. */
export interface PairedDelta {
    /** Mean per-pair delta (`b - a`). */
    mean: number;
    /** Lower interval bound, or null when fewer than two pairs are available. */
    lower: number | null;
    /** Upper interval bound, or null when fewer than two pairs are available. */
    upper: number | null;
    /** Pairs contributing to the mean. */
    pairs: number;
}
/** Knobs for {@link pairedDelta}; defaults keep reports reproducible. */
export interface BootstrapOptions {
    /** Interval confidence, default `0.95`. */
    confidence?: number;
    /** Resample count, default `2000`. */
    resamples?: number;
    /** PRNG seed, default `0`. */
    seed?: number;
}
/**
 * Exact two-sided sign test. Under the null hypothesis a discordant pair is a
 * win or a loss with equal probability, so the win count is Binomial(n, 1/2)
 * and the p-value doubles the smaller tail.
 * @param wins - pairs where B beat A.
 * @param losses - pairs where A beat B.
 * @returns the discordant count and the exact p-value in `[0, 1]`.
 */
export declare function signTest(wins: number, losses: number): SignTestOutcome;
/**
 * Mean paired delta with a percentile bootstrap interval.
 * @param deltas - per-pair differences (`b - a`).
 * @param options - confidence, resample count, and PRNG seed.
 * @returns the mean and interval, or null when `deltas` is empty.
 */
export declare function pairedDelta(deltas: readonly number[], options?: BootstrapOptions): PairedDelta | null;