Michel Petit

I try a short code to have that without regex. Not perfect, but it is a starting point. Examples at the end. Not tested yet on`PgEntity::transformData`, I wrote just a...

Whooooaa ! Thank you very very very much for this great PR! I will check it later this day or tomorrow when I have some time.

Great PR, but I havesome comment like you have see ;-) Many thanks!

For Matrix Norm, read: http://www.les-mathematiques.net/phorum/read.php?2,156345

And also: - http://vassarstats.net/textbook/ch12a.html - http://vassarstats.net/textbook/ch13pt1.html - http://en.wikipedia.org/wiki/Mann-Whitney-Wilcoxon_test - http://en.wikipedia.org/wiki/Wilcoxon_rank-sum_test - http://en.wikipedia.org/wiki/F_test - http://en.wikipedia.org/wiki/F-test_of_equality_of_variances - http://en.wikipedia.org/wiki/Mann%E2%80%93Whitney_U - http://en.wikipedia.org/wiki/Non-parametric_statistics - http://en.wikipedia.org/wiki/Kruskal-Wallis_one-way_analysis_of_variance - http://en.wikipedia.org/wiki/Kendall_tau_rank_correlation_coefficient - http://www.socscistatistics.com/tests/chisquare2/Default2.aspx - https://epilab.ich.ucl.ac.uk/coursematerial/statistics/non_parametric/wilcox_mann_whitney.html - http://www.statisticien.fr/tests-de-rangs/test-wilcoxon-mann-whitney.html

And some other: - http://www.brightstat.com/index.php?option=com_content&task=view&id=35&Itemid=52&limit=1&limitstart=1 - http://www.brightstat.com/index.php?option=com_content&task=view&id=43&Itemid=63&limit=1&limitstart=2