/**
 * [WHO]: Conservative proportion intervals and secondary outcome summaries
 * [FROM]: Completed-run samples only
 * [TO]: Fixed-window adoption measurement
 * [HERE]: extensions/optional/evolution/source/assessment/statistics.ts - protected statistical methods
 */
import type { RunSample } from "../types.js";
export declare function proportionInterval(failures: number, total: number): [number, number];
export declare function failureDeltaInterval(baseline: RunSample[], candidate: RunSample[]): [number, number];
export declare function secondaryRatios(baseline: RunSample[], candidate: RunSample[]): {
    tokens: number;
    latency: number;
};