Statistics::Contingency 0.06

Statistics::Contingency is a Perl module to calculate precision, recall, F1, accuracy, etc.

SYNOPSIS

use Statistics::Contingency;
my $s = new Statistics::Contingency(categories => @all_categories);

while (...something...) {
...
$s->add_result($assigned_categories, $correct_categories);
}

print "Micro F1: ", $s->micro_F1, "n"; # Access a single statistic
print $s->stats_table; # Show several stats in table form

The Statistics::Contingency class helps you calculate several useful statistical measures based on 2x2 "contingency tables". I use these measures to help judge the results of automatic text categorization experiments, but they are useful in other situations as well.

The general usage flow is to tally a whole bunch of results in the Statistics::Contingency object, then query that object to obtain the measures you are interested in. When all results have been collected, you can get a report on accuracy, precision, recall, F1, and so on, with both macro-averaging and micro-averaging over categories.