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

VERSION
       version 3.0702

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:

       o  t = index in the series

       o  S(t) = smoothed series value at position t

       o  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.

       o  X(t) = unsmoothed series value at position t

VERSION
       version 3.0702

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.

AUTHOR
       Shlomi Fish <shlomif@cpan.org>

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.

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.

SUPPORT
   Perldoc
       You can find documentation for this module with the perldoc command.

	 perldoc Statistics::Descriptive::Smoother::Weightedexponential

   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.

       o   MetaCPAN

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

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

       o   Search CPAN

	   The default CPAN search engine, useful to view POD in HTML format.

	   <http://search.cpan.org/dist/Statistics-Descriptive>

       o   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>

       o   AnnoCPAN

	   The AnnoCPAN	is a website that allows community annotations of Perl
	   module documentation.

	   <http://annocpan.org/dist/Statistics-Descriptive>

       o   CPAN	Ratings

	   The CPAN Ratings is a website that allows community ratings and
	   reviews of Perl modules.

	   <http://cpanratings.perl.org/d/Statistics-Descriptive>

       o   CPANTS

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

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

       o   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>

       o   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>

       o   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

perl v5.32.0	     Statistics::Descriptive::Smoother::Weightedexponential(3)

NAME | VERSION | SYNOPSIS | DESCRIPTION | VERSION | METHODS | AUTHOR | COPYRIGHT | LICENSE | AUTHOR | COPYRIGHT AND LICENSE | BUGS | SUPPORT

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