/**
 * Returns the unbiased sample variance of the arguments. For a definition,
 * see http://en.wikipedia.org/wiki/Variance
 *
 * @param datapoints Number samples to analyze.
 * @return The unbiased sample variance of the arguments (0 if fewer
 * than two samples were provided, or {@code NaN} if any of the samples is
 * not a valid number).
 */
export declare function variance(...datapoints: number[]): number;
export default variance;