import { BetaOptions } from '../schemas/BetaOptionsSchema';
import { BetaResult } from '../schemas/BetaResultSchema';
/**
 * Calculate Beta (β)
 *
 * β = Cov(asset, benchmark) / Var(benchmark)
 *
 * Measures systematic risk relative to market/benchmark.
 * β = 1: moves with market
 * β > 1: more volatile than market
 * β < 1: less volatile than market
 *
 * @param options - Asset returns and benchmark returns
 * @returns Beta, covariance, variance, correlation
 */
export declare function calculateBeta(options: BetaOptions): BetaResult;