import type { NumberArray } from 'cheminfo-types';
import type { XVarianceOptions } from './xVariance.ts';
/**
 * Finds the standard deviation for the data at hand
 * @param values - values in the data
 * @param options - options
 * @returns standard deviation
 */
export declare function xStandardDeviation(values: NumberArray, options?: XVarianceOptions): number;
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