import type { CusumInput, CusumResult } from './types.js';
/**
 * CUSUM (Cumulative Sum) Control Chart — Page's Algorithm
 *
 * @formula
 *   - C⁺ₙ = max(0, xₙ − (μ₀ + K) + C⁺ₙ₋₁)
 *   - C⁻ₙ = max(0, (μ₀ − K) − xₙ + C⁻ₙ₋₁)
 *   - Signal when C⁺ or C⁻ > H
 *
 * @reference Page, E.S. (1954). "Continuous inspection schemes"
 * @reference ISO 50001:2018 — CUSUM for energy monitoring
 * @reference Montgomery, D.C. "Introduction to Statistical Quality Control", Ch. 9
 */
export declare function cusum(input: CusumInput): CusumResult;
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