NAME

       Statistics::Descriptive::Smoother::Weigthedexponential - Implement weighted exponential
       smoothing

VERSION

       version 3.0801

SYNOPSIS

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

DESCRIPTION

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

       This algorithm can help to control large swings in the unsmoothed data that arise from
       small samples for those data points.

       The algorithm implements the following formula:

       W(0) = N(0)

       W(t) = ( W(t-1) * CoeffA + N(t) * CoeffB ) / (CoeffA + CoeffB)

       CoeffA = C * ( W(t-1) / (W(t-1) + N(t) ) )

       CoeffB = (1 - C) * ( N(t) * (W(t-1) + N(t)) )

       S(t) = (S(t-1)*CoeffA + X(t)*CoeffB) / (CoeffA + CoeffB)

       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.

AUTHOR

       Fabio Ponciroli

COPYRIGHT

       Copyright(c) 2012 by Fabio Ponciroli.

LICENSE

       This file is licensed under the MIT/X11 License:
       http://www.opensource.org/licenses/mit-license.php.

       Permission is hereby granted, free of charge, to any person obtaining a copy of this
       software and associated documentation files (the "Software"), to deal in the Software
       without restriction, including without limitation the rights to use, copy, modify, merge,
       publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
       to whom the Software is furnished to do so, subject to the following conditions:

       The above copyright notice and this permission notice shall be included in all copies or
       substantial portions of the Software.

       THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
       INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
       PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
       FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
       OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
       DEALINGS IN THE SOFTWARE.

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

AUTHOR

       Shlomi Fish <shlomif@cpan.org>

BUGS

       Please report any bugs or feature requests on the bugtracker website
       <https://github.com/shlomif/perl-Statistics-Descriptive/issues>

       When submitting a bug or request, please include a test-file or a patch to an existing
       test-file that illustrates the bug or desired feature.

COPYRIGHT AND LICENSE

       This software is copyright (c) 1997 by Jason Kastner, Andrea Spinelli, Colin Kuskie, and
       others.

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

perl v5.36.0                          Statistics::Descriptive::Smoother::Weightedexponential(3pm)