Statistics-Running Statistics::Running - Basic descriptive statistics (mean/stdev/ min/max/skew/kurtosis) and discrete Probability Distribution (via histogram) over data without the need to store data points ever. OOP style. Statistics and histogram are updated every time a new data point is added in. The common practice to calculate descriptive statistics for 1 billion data points is to store them in an array, loop over the array to calculate the mean, then loop over the array AGAIN to calculate standard deviation, as Sum (x_i-mean)**2. This module begs to differ... It uses B.P.Welford's method to calculate descriptive statistics by continually adjusting the stats and not storing a single data point in memory. The method is stable and accurate with respect to accumulated precision errors. INSTALLATION To install this module, run the following commands: perl Makefile.PL make make test make bench # <<<< optionally run benchmark make install SUPPORT AND DOCUMENTATION After installing, you can find documentation for this module with the perldoc command. perldoc Statistics::Running You can also look for information at: RT, CPAN's request tracker (report bugs here) http://rt.cpan.org/NoAuth/Bugs.html?Dist=Statistics-Running AnnoCPAN, Annotated CPAN documentation http://annocpan.org/dist/Statistics-Running CPAN Ratings http://cpanratings.perl.org/d/Statistics-Running Search CPAN http://search.cpan.org/dist/Statistics-Running/ LICENSE AND COPYRIGHT Copyright (C) 2018 Andreas Hadjiprocopis This program is free software; you can redistribute it and/or modify it under the terms of the the Artistic License (2.0). You may obtain a copy of the full license at: L<http://www.perlfoundation.org/artistic_license_2_0> Any use, modification, and distribution of the Standard or Modified Versions is governed by this Artistic License. By using, modifying or distributing the Package, you accept this license. Do not use, modify, or distribute the Package, if you do not accept this license. If your Modified Version has been derived from a Modified Version made by someone other than you, you are nevertheless required to ensure that your Modified Version complies with the requirements of this license. This license does not grant you the right to use any trademark, service mark, tradename, or logo of the Copyright Holder. This license includes the non-exclusive, worldwide, free-of-charge patent license to make, have made, use, offer to sell, sell, import and otherwise transfer the Package with respect to any patent claims licensable by the Copyright Holder that are necessarily infringed by the Package. If you institute patent litigation (including a cross-claim or counterclaim) against any party alleging that the Package constitutes direct or contributory patent infringement, then this Artistic License to you shall terminate on the date that such litigation is filed. Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE OF THE PACKAGE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.