import type { array, matrix } from "../types";
/**
 * Quartiles of a sample.
 *
 * Calculates the three quartiles (Q1, Q2, Q3) which divide the data into four equal parts.
 * Q1 is the 25th percentile, Q2 is the median (50th percentile), and Q3 is the 75th percentile.
 *
 * @param x Input array or matrix
 * @param dim Dimension along which to compute quartiles. Default is 0
 * @returns Array containing [Q1, Q2, Q3] values
 * @throws When input is invalid
 *
 * @example Simple quartiles
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(quartile([1, 2, 3, 4, 5]), [1.75, 3, 4.25]);
 *
 * ```
 *
 * @example Even number of elements
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(quartile([1, 2, 3, 4]), [1.5, 2.5, 3.5]);
 *
 * ```
 *
 * @example Quartiles provide Q1, Q2 (median), Q3
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(quartile([10, 20, 30, 40]), [15, 25, 35]);
 * ```
 */
export default function quartile(x: array, dim?: 0 | 1): array;
/**
 * Quartiles of a sample.
 *
 * Calculates the three quartiles (Q1, Q2, Q3) which divide the data into four equal parts.
 * Q1 is the 25th percentile, Q2 is the median (50th percentile), and Q3 is the 75th percentile.
 *
 * @param x Input array or matrix
 * @param dim Dimension along which to compute quartiles. Default is 0
 * @returns Array containing [Q1, Q2, Q3] values
 * @throws When input is invalid
 *
 * @example Simple quartiles
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(quartile([1, 2, 3, 4, 5]), [1.75, 3, 4.25]);
 *
 * ```
 *
 * @example Even number of elements
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(quartile([1, 2, 3, 4]), [1.5, 2.5, 3.5]);
 *
 * ```
 *
 * @example Quartiles provide Q1, Q2 (median), Q3
 * ```ts
 * import { assertEquals } from "jsr:@std/assert";
 *
 * assertEquals(quartile([10, 20, 30, 40]), [15, 25, 35]);
 * ```
 */
export default function quartile(x: matrix, dim?: 0 | 1): matrix;
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