import type { StatisticsInput, StatisticsResult } from './types.js';
/**
 * Descriptive statistics (count, sum, mean, median, min, max, range, variance, stdDev)
 *
 * `variance`/`stdDev` are population statistics (divisor n);
 * `sampleVariance`/`sampleStdDev` use Bessel's correction (divisor n−1)
 * and are undefined when the data set has fewer than 2 values.
 *
 * @param input - Statistics input with data array
 * @returns Descriptive statistics for the data set
 * @throws RangeError if data is missing or empty
 */
export declare function statistics(input: StatisticsInput): StatisticsResult;
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