@thi.ng/vectors/variance.d.ts

Optimized 2d/3d/4d and arbitrary length vector operations, support for memory mapping/layouts

import type { ReadonlyVec } from "./api.js";
/**
 * Computes variance of vector components in `a`. If `isCentered` is
 * false (default), the vector will first be {@link center}ed (copy) in order to
 * compute the result.
 *
 * @remarks
 * var(a) = magSq(a) / len(a). Returns 0 if `a` is empty.
 *
 * Reference:
 * https://en.wikipedia.org/wiki/Variance
 *
 * @param a -
 * @param isCentered -
 */
export declare const variance: (a: ReadonlyVec, isCentered?: boolean) => number;
/**
 * Computes standard deviation of vector components in `a`. If `isCentered` is
 * false (default), the vector will first be {@link center}ed (copy) in order to
 * compute the result.
 *
 * @remarks
 * sd = sqrt(magSq(a) / (len(a) - 1)). Returns 0 if len(a) < 2
 *
 * Reference:
 * https://en.wikipedia.org/wiki/Standard_deviation
 *
 * @param a -
 * @param isCentered -
 */
export declare const sd: (a: ReadonlyVec, isCentered?: boolean) => number;
/**
 * Computes the standard error of vector components in `a`. If `isCentered` is
 * false (default), the vector will first be {@link center}ed (copy) in order to
 * compute the result.
 *
 * @remarks
 * sderr(a) = sd(a) / sqrt(len(a))
 *
 * Reference:
 * https://en.wikipedia.org/wiki/Standard_error
 *
 * @param a -
 * @param isCentered -
 */
export declare const sdError: (a: ReadonlyVec, isCentered?: boolean) => number;
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