Making some progress on the module. So here's some sample data for a column with the raw count and cardinality value for each unique value in the column: 

        $VAR1 = {
          'ACTIVE' => {
                        'count' => 1941,
                        'value_card' => '0.631630328669053'
                      },
          'INACTIVE' => {
                          'value_card' => '0.233322486169867',
                          'count' => 717
                        },
          'RETIRED' => {
                         'count' => 414,
                         'value_card' => '0.134721770257078'
                       },
          'STATUS' => {
                          'count' => 1,
                          'value_card' => '0.000325414904002603'
                       }
        };

[download]

So in this simple case, the 'STATUS' value is unique to this column and is clearly an outlier from the other three possible values. But in fuzzier situations, how would I determine whether 'STATUS' is "1 standard deviation" away from the other value cardinality values?

$PM = "Perl Monk's";
$MCF = "Most Clueless Friar Abbot Bishop Pontiff Deacon Curate Priest Vicar";
$nysus = $PM . ' ' . $MCF;
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In reply to Re^2: Useful heuristics for analyzing arrays of data to determine column header by nysus
in thread Useful heuristics for analyzing arrays of data to determine column header by nysus

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