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    @stdlib/stats-incr-meanabs2
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    0.0.7 • Public • Published

    incrmeanabs2

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    Compute an arithmetic mean of squared absolute values incrementally.

    The arithmetic mean of squared absolute values is defined as

    Equation for the arithmetic mean of squared absolute values.

    Installation

    npm install @stdlib/stats-incr-meanabs2

    Usage

    var incrmeanabs2 = require( '@stdlib/stats-incr-meanabs2' );

    incrmeanabs2()

    Returns an accumulator function which incrementally computes an arithmetic mean of squared absolute values.

    var accumulator = incrmeanabs2();

    accumulator( [x] )

    If provided an input value x, the accumulator function returns an updated mean. If not provided an input value x, the accumulator function returns the current mean.

    var accumulator = incrmeanabs2();
    
    var m = accumulator( 2.0 );
    // returns 4.0
    
    m = accumulator( -1.0 );
    // returns 2.5
    
    m = accumulator( -3.0 );
    // returns ~4.67
    
    m = accumulator();
    // returns ~4.67

    Notes

    • Input values are not type checked. If provided NaN or a value which, when used in computations, results in NaN, the accumulated value is NaN for all 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.

    Examples

    var randu = require( '@stdlib/random-base-randu' );
    var incrmeanabs2 = require( '@stdlib/stats-incr-meanabs2' );
    
    var accumulator;
    var v;
    var i;
    
    // Initialize an accumulator:
    accumulator = incrmeanabs2();
    
    // For each simulated datum, update the mean...
    for ( i = 0; i < 100; i++ ) {
        v = ( randu()*100.0 ) - 50.0;
        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.

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    License

    See LICENSE.

    Copyright

    Copyright © 2016-2022. The Stdlib Authors.

    Install

    npm i @stdlib/stats-incr-meanabs2

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    91

    Version

    0.0.7

    License

    Apache-2.0

    Unpacked Size

    47 kB

    Total Files

    10

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser