Nimble Prime Musketeers

    @stdlib/stats-incr-mmidrange
    TypeScript icon, indicating that this package has built-in type declarations

    0.0.6 • Public • Published

    incrmmidrange

    NPM version Build Status Coverage Status

    Compute a moving mid-range incrementally.

    The mid-range, or mid-extreme, is the arithmetic mean of maximum and minimum values. Accordingly, the mid-range is the midpoint of the range and a measure of central tendency.

    Installation

    npm install @stdlib/stats-incr-mmidrange

    Usage

    var incrmmidrange = require( '@stdlib/stats-incr-mmidrange' );

    incrmmidrange( window )

    Returns an accumulator function which incrementally computes a moving mid-range. The window parameter defines the number of values over which to compute the moving mid-range.

    var accumulator = incrmmidrange( 3 );

    accumulator( [x] )

    If provided an input value x, the accumulator function returns an updated mid-range. If not provided an input value x, the accumulator function returns the current mid-range.

    var accumulator = incrmmidrange( 3 );
    
    var mr = accumulator();
    // returns null
    
    // Fill the window...
    mr = accumulator( 2.0 ); // [2.0]
    // returns 2.0
    
    mr = accumulator( 1.0 ); // [2.0, 1.0]
    // returns 1.5
    
    mr = accumulator( 3.0 ); // [2.0, 1.0, 3.0]
    // returns 2.0
    
    // Window begins sliding...
    mr = accumulator( -7.0 ); // [1.0, 3.0, -7.0]
    // returns -2.0
    
    mr = accumulator( -5.0 ); // [3.0, -7.0, -5.0]
    // returns -2.0
    
    mr = accumulator();
    // returns -2.0

    Notes

    • Input values are not type checked. If provided NaN, the accumulated value is NaN for at least W-1 future invocations. If non-numeric inputs are possible, you are advised to type check and handle accordingly before passing the value to the accumulator function.
    • As W values are needed to fill the window buffer, the first W-1 returned values are calculated from smaller sample sizes. Until the window is full, each returned value is calculated from all provided values.

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var incrmmidrange = require( '@stdlib/stats-incr-mmidrange' );
    
    var accumulator;
    var v;
    var i;
    
    // Initialize an accumulator:
    accumulator = incrmmidrange( 5 );
    
    // For each simulated datum, update the moving mid-range...
    for ( i = 0; i < 100; i++ ) {
        v = randu() * 100.0;
        accumulator( v );
    }
    console.log( accumulator() );

    See Also


    Notice

    This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

    For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

    Community

    Chat


    License

    See LICENSE.

    Copyright

    Copyright © 2016-2022. The Stdlib Authors.

    Install

    npm i @stdlib/stats-incr-mmidrange

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    87

    Version

    0.0.6

    License

    Apache-2.0

    Unpacked Size

    44 kB

    Total Files

    9

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser