/**
 * Computes the covariance matrix, with an option to invert it.
 *
 * @example
 * Basic usage
 * ```js
 * const data = [
 *   [1, 2, 3],
 *   [4, 5, 6],
 *   [7, 8, 9]
 * ];
 * const covMatrix = getCovarianceMatrix(data);
 * // Or inverted...
 * const invertedCovMatrix = getCovarianceMatrix(data, { invert: true });
 * ```
 *
 * @param data - A 2D array of numbers representing the dataset.
 * @param options - An optional object with an `invert` boolean property.
 *
 * @category Statistics
 */
export default function getCovarianceMatrix(data: number[][], options?: {
    invert?: boolean;
}): number[][];