Revision history for Perl extension Statistics::Descriptive. 3.0300 February 11, 2012 - Now mean() and median() and other routines return undef() if there are no data. - Somewhat incompatible change: some methods that returned undef() under list context now return an empty list (so it will be false). - it is generally not recommended to call such methods in list context as they should always be called in scalar context. - Resolves https://rt.cpan.org/Ticket/Display.html?id=74693 - thanks to Shawn Laffan for the report and the patch. 3.0203 November 17, 2011 - Fix https://rt.cpan.org/Ticket/Display.html?id=72495 . - percentile should not die and should return undef if there are no elements in the collection. 3.0202 July 23, 2011 - Moved tag-release.pl to scripts/tag-release.pl (though we now use Mercurial instead of Subversion.) - Add t/mode.t to test the ->mode() method. - Documented ->mode() better. - Optimized ->mode(). 3.0201 October 14, 2010 - Add some documentation clarifying the 0th percentile return, as it returns undef() for representing -inf: - Fix https://rt.cpan.org/Ticket/Display.html?id=62055 - Thanks to Dave Breimann for reporting it. - Add the tag-release.pl to tag a release using Subversion. 3.0200 June 18, 2010 - Added skewness and kurtosis - https://rt.cpan.org/Ticket/Display.html?id=58187 - Thanks to Shawn Laffan. - Removed the Changes / Revision log from the .pm file. 3.0102 June 15, 2010 - Add the $VERSION variable to Statistics::Descriptive::Sparse and Statistics::Descriptive::Full. This was done to silence the CPAN indexer. 3.0101 June 15, 2010 - Moved the trimmed_mean caching test (that used the Benchmark.pm module) to rejects/descr.t , because it kept failing. 3.0100 July 20, 2009 - Added the quantile method - thanks to Djibril Ousmanou (DJIBEL). - https://rt.cpan.org/Ticket/Display.html?id=47948 3.0000 May 29, 2009 - Added tests (for ->count, ->sum, ->sumsq, ->min, ->max) - Localized the scope of $stat and other variables in t/descr.t - Got rid of AUTOLOAD in favour of individual accessors. - Converted many direct member accesses to the accessors. - Added ->frequency_distribution_ref() which deprecates frequency_distribution(). - Some refactoring of the lib/Statistics/Descriptive.pm module (without breaking the documented API). 2.9 May 13, 2009 - Fixed bug https://rt.cpan.org/Public/Bug/Display.html?id=46026 : - standard_deviation failing due to a variance that got evaluated to 0 due to rounding errors. - Kwalitee : added a LICENSE section to the POD. - Kwalitee (CPANTS) : added an examples/ directory with a script. 2.8 May 09, 2009 - Enabled "./Build runtest" and "./Build distruntest" (using Test::Run) in the distribution. - Fixed incomplete/broken tests in t/descr.t. 2.7 May 03, 2009 - Converted the distribution to Build.PL and re-organized it to put everything under its proper place. Started maintaining it in: - http://svn.berlios.de/svnroot/repos/web-cpan/Statistics-Descriptive/ - Converted t/descr.t to use "use strict;" and "use warnings;". - Converted t/descr.t to use Test::More. - Cleaned up the "use" statement of lib/Statistics/Descriptive.pm. - Added more explicit dependencies (core, though) to Build.PL. - Fixed RT bug #34999: freq distribution generated too many bins. - https://rt.cpan.org/Ticket/Display.html?id=34999 - Added some keywords and resources to the META.yml, using Build.PL's meta_merge. - Fixed https://rt.cpan.org/Ticket/Display.html?id=32183 - more authoritative (and non-broken) link to the RFC. - Applied the patch in https://rt.cpan.org/Ticket/Display.html?id=9160 - {{#9160: Variance and Standard Deviation use costly pseudo-variance, instead of computing real variance}}. 2.6 October 10, 2002 - Fixed caching in trimmed mean and modified code to allow trimming 0% from upper bound. Formerly if 0 was requested then it used the lower bound! - POD format patch from ddunlap 2.5 Wednesday, May 12 1999 - Forgot to document change in v2.4, which included fixing percentile so that it worked right and added to the test harness. - Modified frequency_distribution so that specific bins could be passed in. Fixed caching so that it actually works (it only used to get stuck returning the result of the first call). - Turned off caching for least_squares_fit because there's no way to generate a unique key for memorization. 2.3 Thursday Nov 12 1998 - Fix for frequency distribution. Changed Makefile.PL to ease ActiveState distribution of the module. Andrea's code for preventing division by zero and other improvements. He also wrote a great test bench. Added code from Warren Matthews to calculate percentile. 2.2 Monday Feb 23 1998 - Multiple bug fixes: Fixed min/max bug with '0' vs defined. Provided fix for bug with AUTOLOAD/DESTROY/Carp problem. 2.1 Tues Sep 02 1997 - Multiple bug fixes: Cleaned up syntax error with my scoping. Fixed errors in least_squares_fit and median methods 2.00 Wed Aug 20 13:22:51 1997 - new version; created by h2xs 1.16 - Complete rewrite of OO interface by Colin Kuskie. - Now has 2 classes instead of 1.5, a base class without data storage and a class that inherits the base methods and extends them with data storage and more statistics. 1.1 April 1995 - Added LeastSquaresFit and FrequencyDistribution. 1.0 March 1995 - Released to comp.lang.perl and placed on archive sites. 0.20 December 1994 - Complete rewrite after extensive and invaluable e-mail correspondence with Anno Siegel. 0.10 December 1994 - Initital concept, released to perl5-porters list. - Jason Kastner