import type { NumberArray } from 'cheminfo-types';
export interface XNoiseStandardDeviationResult {
    /**
     * Median of the data
     */
    median: number;
    /**
     * Median absolute deviation
     */
    mad: number;
    /**
     * standard deviation of the noise
     */
    sd: number;
}
/**
 * Determine noise level using MAD https://en.wikipedia.org/wiki/Median_absolute_deviation
 * Constant to convert mad to sd calculated using https://www.wolframalpha.com/input?i=sqrt%282%29+inverse+erf%280.5%29
 * This assumes a gaussian distribution of the noise
 * @param array - array of numbers.
 * @returns noise level corresponding to one standard deviation.
 */
export declare function xNoiseStandardDeviation(array: NumberArray): XNoiseStandardDeviationResult;
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