/**
 * Computes the Goodman-Kruskal gamma coefficient for ordinal association.
 *
 * @category Metrics
 * @param {number[] | Float64Array} a - First categorical/ordinal variable
 * @param {number[] | Float64Array} b - Second categorical/ordinal variable
 * @returns {number} The Goodman-Kruskal gamma coefficient between `a` and `b` (-1 to 1).
 * @see {@link https://en.wikipedia.org/wiki/Goodman_and_Kruskal%27s_gamma}
 */
export function goodman_kruskal(a: number[] | Float64Array, b: number[] | Float64Array): number;
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