import type { CmkInput, CmkResult } from './types.js';
/**
 * Calculate Cmk (Machine Capability Index)
 *
 * @formula
 *   - Cm  = (USL - LSL) / (6σ)
 *   - Cmk = min((USL - x̄) / (3σ), (x̄ - LSL) / (3σ))
 *   - Threshold: Cmk ≥ 1.67 (stricter than Cpk ≥ 1.33)
 *
 * @reference VDA 5 — Measurement System Analysis
 * @reference ISO 22514-3:2020 — Machine performance studies
 *
 * @param input - Raw measurements and specification limits
 * @returns Machine capability indices
 */
export declare function cmk(input: CmkInput): CmkResult;
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