NAME

       Statistics::Descriptive::Smoother - Base module for smoothing statistical data

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 provide methods to smooth the trend of a series of statistical data.

       The methods provided are the "Exponential" and the "Weighted Exponential" (see respectively
       "Statistics::Descriptive::Smoother::Exponential" and
       "Statistics::Descriptive::Smoother::Weightedexponential" for more details).

       This class is just a factory that will instantiate the object to perform the chosen smoothing algorithm.

METHODS

       Statistics::Descriptive::Smoother->instantiate({});
            Create a new Smoother object.

            This method require several parameters:

            method
                 Method used for the smoothing. Allowed values are: "exponential" and "weightedexponential"

            coeff
                 Smoothing  coefficient. It needs to be in the [0;1] range, otherwise undef will be reutrned.  0
                 means that the series is not smoothed at all, while 1 the series is universally  equal  to  the
                 initial unsmoothed value.

            data Array ref with the data of the series. At least 2 values are needed to smooth the series, undef
                 is returned otherwise.

            samples
                 Array  ref  with the samples each data value has been built with. This is an optional parameter
                 since it is not used by all the smoothing algorithm.

       $smoother->get_smoothing_coeff();
            Returns the smoothing coefficient.

       $smoother->set_smoothing_coeff(0.5);
            Set the smoothing coefficient value. It needs to be in the [0;1]  range,  otherwise  undef  will  be
            reutrned.

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.

perl v5.14.2                                       2013-05-23             Statistics::Descriptive::Smoother(3pm)