/**
 * @copyright Sister Software
 * @license AGPL-3.0
 * @author Teffen Ellis, et al.
 *
 *   Statistical helpers using nearest-rank percentiles.
 */
/**
 * Nearest-rank percentile over an unsorted sample; `null` on an empty sample. `p` in [0, 100].
 */
export declare function percentile(xs: readonly number[], p: number): number | null;
/**
 * `percentile(xs, 50)`.
 */
export declare function median(xs: readonly number[]): number | null;
/**
 * Format `numerator / denominator` as a fixed-digit percentage (`"12.5%"`); `"—"` when `denominator` is 0.
 */
export declare function formatPercent(numerator: number, denominator: number, digits?: number): string;
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