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Set::Similarity::Dice - Dice coefficent for sets
use Set::Similarity::Dice; my $dice = Set::Similarity::Dice->new; my $similarity = $dice->similarity('Photographer','Fotograf');
The Dice coefficient is the number of elements in common to both sets relative to the average size of the total number of elements present, i.e.
( A intersect B ) / 0.5 ( A + B ) # the same as sorensen
The weighting factor comes from the 0.5 in the denominator. The range is 0 to 1.
my $similarity = $object->from_sets(['a'],['b']);
This method expects two arrayrefs of strings as parameters. The parameters are not checked, thus can lead to funny results or uncatched divisions by zero.
If you want to use this method directly, you should take care that the elements are unique. Also you should catch the situation where one of the arrayrefs is empty (similarity is 0), or both are empty (similarity is 1).
Helmut Wollmersdorfer, <firstname.lastname@example.org>
Copyright (C) 2013-2014 by Helmut Wollmersdorfer
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.