Statistics::Descriptive::Smoother::Exponential(3pm)

Usage

  use Statistics::Descriptive::Smoother;
  my $smoother = Statistics::Descriptive::Smoother->instantiate({
           method   => 'exponential',
           coeff    => 0.5,
           data     => [1, 2, 3, 4, 5],
           samples  => [110, 120, 130, 140, 150],
    });
  my @smoothed_data = $smoother->get_smoothed_data();

Version

version 3.0801

Overview

This module implement the exponential smoothing algorithm to smooth the trend of a series of statistical data.

This algorithm works well for unsmoothed data build with big number of samples. If this is not the case you might consider using the "Weighted Exponential" one.

The algorithm implements the following formula:

S(0) = X(0)

S(t) = C*S(t-1) + (1-C)*X(t)

where:

•: t = index in the series

•: S(t) = smoothed series value at position t

•: C = smoothing coefficient. Value in the [0;1] range. 0 means that the series is not smoothed at all, while 1 the series is universally equal to the initial unsmoothed value.

•: X(t) = unsmoothed series value at position t

Methods

$stats->get_smoothed_data();: Returns a copy of the smoothed data array.

Support

Websites

The following websites have more information about this module, and may be of help to you. As always, in addition to those websites please use your favorite search engine to discover more resources.

•

MetaCPAN

A modern, open-source CPAN search engine, useful to view POD in HTML format.

<https://metacpan.org/release/Statistics-Descriptive>

•

RT: CPAN's Bug Tracker

The RT ( Request Tracker ) website is the default bug/issue tracking system for CPAN.

<https://rt.cpan.org/Public/Dist/Display.html?Name=Statistics-Descriptive>

•

CPANTS

The CPANTS is a website that analyzes the Kwalitee ( code metrics ) of a distribution.

<http://cpants.cpanauthors.org/dist/Statistics-Descriptive>

•

CPAN Testers

The CPAN Testers is a network of smoke testers who run automated tests on uploaded CPAN distributions.

<http://www.cpantesters.org/distro/S/Statistics-Descriptive>

•

CPAN Testers Matrix

The CPAN Testers Matrix is a website that provides a visual overview of the test results for a distribution on various Perls/platforms.

<http://matrix.cpantesters.org/?dist=Statistics-Descriptive>

•

CPAN Testers Dependencies

The CPAN Testers Dependencies is a website that shows a chart of the test results of all dependencies for a distribution.

<http://deps.cpantesters.org/?module=Statistics::Descriptive>

Bugs / Feature Requests

Please report any bugs or feature requests by email to "bug-statistics-descriptive at rt.cpan.org", or through the web interface at <https://rt.cpan.org/Public/Bug/Report.html?Queue=Statistics-Descriptive>. You will be automatically notified of any progress on the request by the system.

Source Code

The code is open to the world, and available for you to hack on. Please feel free to browse it and play with it, or whatever. If you want to contribute patches, please send me a diff or prod me to pull from your repository :)

<https://github.com/shlomif/perl-Statistics-Descriptive>

  git clone git://github.com/shlomif/perl-Statistics-Descriptive.git

Copyright and license

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

Releases

7 releases since Debian 7 (Wheezy); the text changed 5 times.

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