Calculate the Jaccard Similarity Coefficient.

NAME
   Set::Jaccard::SimilarityCoefficient - Calculate the Jaccard Similarity
   Coefficient of 2 sets

VERSION
   # VERSION

SYNOPSIS
   $res = Set::Jaccard::SimilarityCoefficient::calc(\@set_a, \@set_b);

   OR

   my $a = Set::Scalar->new(@set_a); my $b = Set::Scalar->new(@set_b); $res
   = Set::Jaccard::SimilarityCoefficient::calc($a, $b);

DESCRIPTION
   Set::Jaccard::SimilarityCoefficient lets you calculate the Jaccard
   Similarity Coefficient for either arrayrefs or Set::Scalar objects.

   Briefly, the Jaccard Similarity Coefficient is a simple measure of how
   similar 2 sets are. The calculation is (in pseudo-code):

           count(difference(SET-A, SET-B)) / count(union(SET-A, SET-B))

   There is a Jaccard Similarity Coefficient routine already in CPAN, but
   it is specialized for use by Text::NSP. I wanted a generic routine that
   could be used by anyone so Set::Jaccard::SimilarityCoefficient was born.

SUBROUTINES/METHODS
   calc(A, B) calculates the Jaccard Similarity Coefficient for the
   arguments A and B. A and B can be either array references or Set::Scalar
   objects.

DIAGNOSTICS
   new() will complain if A or B is empty, not either a reference to an
   array, or not a Set::Scalar object.

   calc() could theoretically throw DivideByZeroException when the union of
   the two sets has 0 members. However, that would require set A or set B
   to have 0 members, which was previously prohibited by the prohibition on
   empty sets.

CONFIGURATION AND ENVIRONMENT
   This module should work wherever Perl works.

DEPENDENCIES
   Set::Scalar

INCOMPATIBILITIES
   None that I know of.

BUGS AND LIMITATIONS
   There are no bugs that I know of. Given that this is non-trivial code,
   there will be bugs.

   The types of arguments are limited to either array references or
   Set::Scalar objects.

AUTHOR
   Mark Leighton Fisher, <[email protected]>

LICENSE AND COPYRIGHT
   Set::JaccardSimilarityCoefficient is licensed under the same terms as
   Perl itself.

POD ERRORS
   Hey! The above document had some coding errors, which are explained
   below:

   Around line 26:
       Unknown directive: =function

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