1Statistics::DescriptiveU:s:eSrmoCootnShtterarit:bi:usEttxeipdcosnP:ee:nrDtleisaDclor(ci3up)mteinvtea:t:iSomnoother::Exponential(3)
2
6 Statistics::Descriptive::Smoother::Exponential - Implement exponential
7 smoothing
8
10 version 3.0702
11
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
23 This module implement the exponential smoothing algorithm to smooth the
24 trend of a series of statistical data.
25 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 The algorithm implements the following formula:
31 S(0) = X(0)
33 S(t) = C*S(t-1) + (1-C)*X(t)
35 where:
37 · t = index in the series
39 · S(t) = smoothed series value at position t
41 · 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 · X(t) = unsmoothed series value at position t
47
49 version 3.0702
50
52 $stats->get_smoothed_data();
53 Returns a copy of the smoothed data array.
54
56 Fabio Ponciroli
57
59 Copyright(c) 2012 by Fabio Ponciroli.
60
62 This file is licensed under the MIT/X11 License:
63 http://www.opensource.org/licenses/mit-license.php.
64 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 The above copyright notice and this permission notice shall be included
74 in all copies or substantial portions of the Software.
75 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
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 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
95 Please report any bugs or feature requests on the bugtracker website
96 <https://github.com/shlomif/perl-Statistics-Descriptive/issues>
97 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
102 Perldoc
103 You can find documentation for this module with the perldoc command.
104 perldoc Statistics::Descriptive::Smoother::Exponential
106 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 · MetaCPAN
113 A modern, open-source CPAN search engine, useful to view POD in
115 HTML format.
116 <https://metacpan.org/release/Statistics-Descriptive>
118 · Search CPAN
120 The default CPAN search engine, useful to view POD in HTML format.
122 <http://search.cpan.org/dist/Statistics-Descriptive>
124 · RT: CPAN's Bug Tracker
126 The RT ( Request Tracker ) website is the default bug/issue
128 tracking system for CPAN.
129 <https://rt.cpan.org/Public/Dist/Display.html?Name=Statistics-Descriptive>
131 · AnnoCPAN
133 The AnnoCPAN is a website that allows community annotations of Perl
135 module documentation.
136 <http://annocpan.org/dist/Statistics-Descriptive>
138 · CPAN Ratings
140 The CPAN Ratings is a website that allows community ratings and
142 reviews of Perl modules.
143 <http://cpanratings.perl.org/d/Statistics-Descriptive>
145 · CPANTS
147 The CPANTS is a website that analyzes the Kwalitee ( code metrics )
149 of a distribution.
150 <http://cpants.cpanauthors.org/dist/Statistics-Descriptive>
152 · CPAN Testers
154 The CPAN Testers is a network of smoke testers who run automated
156 tests on uploaded CPAN distributions.
157 <http://www.cpantesters.org/distro/S/Statistics-Descriptive>
159 · CPAN Testers Matrix
161 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 <http://matrix.cpantesters.org/?dist=Statistics-Descriptive>
167 · CPAN Testers Dependencies
169 The CPAN Testers Dependencies is a website that shows a chart of
171 the test results of all dependencies for a distribution.
172 <http://deps.cpantesters.org/?module=Statistics::Descriptive>
174 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 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 <https://github.com/shlomif/perl-Statistics-Descriptive>
190 git clone git://github.com/shlomif/perl-Statistics-Descriptive.git
192perl v5.30.1 Stati2s0t2i0c-s0:1:-D3e0scriptive::Smoother::Exponential(3)