1Statistics::DescriptiveU:s:eSrmoCootnShtterarit:bi:usEttxeipdcosnP:ee:nrDtleisaDclor(ci3up)mteinvtea:t:iSomnoother::Exponential(3)
2
3
4

NAME

6       Statistics::Descriptive::Smoother::Exponential - Implement exponential
7       smoothing
8

VERSION

10       version 3.0702
11

SYNOPSIS

13         use Statistics::Descriptive::Smoother;
14         my $smoother = Statistics::Descriptive::Smoother->instantiate({
15                  method   => 'exponential',
16                  coeff    => 0.5,
17                  data     => [1, 2, 3, 4, 5],
18                  samples  => [110, 120, 130, 140, 150],
19           });
20         my @smoothed_data = $smoother->get_smoothed_data();
21

DESCRIPTION

23       This module implement the exponential smoothing algorithm to smooth the
24       trend of a series of statistical data.
25
26       This algorithm works well for unsmoothed data build with big number of
27       samples. If this is not the case you might consider using the "Weighted
28       Exponential" one.
29
30       The algorithm implements the following formula:
31
32       S(0) = X(0)
33
34       S(t) = C*S(t-1) + (1-C)*X(t)
35
36       where:
37
38       ·  t = index in the series
39
40       ·  S(t) = smoothed series value at position t
41
42       ·  C = smoothing coefficient. Value in the [0;1] range. 0 means that
43          the series is not smoothed at all, while 1 the series is universally
44          equal to the initial unsmoothed value.
45
46       ·  X(t) = unsmoothed series value at position t
47

VERSION

49       version 3.0702
50

METHODS

52       $stats->get_smoothed_data();
53            Returns a copy of the smoothed data array.
54

AUTHOR

56       Fabio Ponciroli
57
59       Copyright(c) 2012 by Fabio Ponciroli.
60

LICENSE

62       This file is licensed under the MIT/X11 License:
63       http://www.opensource.org/licenses/mit-license.php.
64
65       Permission is hereby granted, free of charge, to any person obtaining a
66       copy of this software and associated documentation files (the
67       "Software"), to deal in the Software without restriction, including
68       without limitation the rights to use, copy, modify, merge, publish,
69       distribute, sublicense, and/or sell copies of the Software, and to
70       permit persons to whom the Software is furnished to do so, subject to
71       the following conditions:
72
73       The above copyright notice and this permission notice shall be included
74       in all copies or substantial portions of the Software.
75
76       THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
77       OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
78       MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
79       IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
80       CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
81       TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
82       SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
83

AUTHOR

85       Shlomi Fish <shlomif@cpan.org>
86
88       This software is copyright (c) 1997 by Jason Kastner, Andrea Spinelli,
89       Colin Kuskie, and others.
90
91       This is free software; you can redistribute it and/or modify it under
92       the same terms as the Perl 5 programming language system itself.
93

BUGS

95       Please report any bugs or feature requests on the bugtracker website
96       <https://github.com/shlomif/perl-Statistics-Descriptive/issues>
97
98       When submitting a bug or request, please include a test-file or a patch
99       to an existing test-file that illustrates the bug or desired feature.
100

SUPPORT

102   Perldoc
103       You can find documentation for this module with the perldoc command.
104
105         perldoc Statistics::Descriptive::Smoother::Exponential
106
107   Websites
108       The following websites have more information about this module, and may
109       be of help to you. As always, in addition to those websites please use
110       your favorite search engine to discover more resources.
111
112       ·   MetaCPAN
113
114           A modern, open-source CPAN search engine, useful to view POD in
115           HTML format.
116
117           <https://metacpan.org/release/Statistics-Descriptive>
118
119       ·   Search CPAN
120
121           The default CPAN search engine, useful to view POD in HTML format.
122
123           <http://search.cpan.org/dist/Statistics-Descriptive>
124
125       ·   RT: CPAN's Bug Tracker
126
127           The RT ( Request Tracker ) website is the default bug/issue
128           tracking system for CPAN.
129
130           <https://rt.cpan.org/Public/Dist/Display.html?Name=Statistics-Descriptive>
131
132       ·   AnnoCPAN
133
134           The AnnoCPAN is a website that allows community annotations of Perl
135           module documentation.
136
137           <http://annocpan.org/dist/Statistics-Descriptive>
138
139       ·   CPAN Ratings
140
141           The CPAN Ratings is a website that allows community ratings and
142           reviews of Perl modules.
143
144           <http://cpanratings.perl.org/d/Statistics-Descriptive>
145
146       ·   CPANTS
147
148           The CPANTS is a website that analyzes the Kwalitee ( code metrics )
149           of a distribution.
150
151           <http://cpants.cpanauthors.org/dist/Statistics-Descriptive>
152
153       ·   CPAN Testers
154
155           The CPAN Testers is a network of smoke testers who run automated
156           tests on uploaded CPAN distributions.
157
158           <http://www.cpantesters.org/distro/S/Statistics-Descriptive>
159
160       ·   CPAN Testers Matrix
161
162           The CPAN Testers Matrix is a website that provides a visual
163           overview of the test results for a distribution on various
164           Perls/platforms.
165
166           <http://matrix.cpantesters.org/?dist=Statistics-Descriptive>
167
168       ·   CPAN Testers Dependencies
169
170           The CPAN Testers Dependencies is a website that shows a chart of
171           the test results of all dependencies for a distribution.
172
173           <http://deps.cpantesters.org/?module=Statistics::Descriptive>
174
175   Bugs / Feature Requests
176       Please report any bugs or feature requests by email to
177       "bug-statistics-descriptive at rt.cpan.org", or through the web
178       interface at
179       <https://rt.cpan.org/Public/Bug/Report.html?Queue=Statistics-Descriptive>.
180       You will be automatically notified of any progress on the request by
181       the system.
182
183   Source Code
184       The code is open to the world, and available for you to hack on. Please
185       feel free to browse it and play with it, or whatever. If you want to
186       contribute patches, please send me a diff or prod me to pull from your
187       repository :)
188
189       <https://github.com/shlomif/perl-Statistics-Descriptive>
190
191         git clone git://github.com/shlomif/perl-Statistics-Descriptive.git
192
193
194
195perl v5.30.1                 Stati2s0t2i0c-s0:1:-D3e0scriptive::Smoother::Exponential(3)
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