import { Any, Options } from "../../types";
/**
 * Returns the median of the dataset. The 'expr.method' defaults to "approximate" to return a median value from the dataset.
 *
 * If 'expr.method' is "approximate", we return the smallest of the middle values when dataset is even.
 * If 'expr.method' is "exact", we return the average of the middle values when dataset is even.
 * For an odd dataset, the middle value is always returned regardless of 'expr.method'.
 */
export declare const $median: (coll: Any[], expr: {
    input: Any;
    method: "approximate" | "exact";
}, options: Options) => number;