# FreeBSD Manual Pages

```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

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>

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
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

<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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