NAME

       Statistics::Descriptive::Smoother::Exponential - Implement exponential smoothing

VERSION

       version 3.0801

SYNOPSIS

         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();

DESCRIPTION

       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.

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                                       2023-08-11             Statistics::Des...er::Exponential(3pm)