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<?php |
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/* |
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Condorcet PHP - Election manager and results calculator. |
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Designed for the Condorcet method. Integrating a large number of algorithms extending Condorcet. Expandable for all types of voting systems. |
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By Julien Boudry and contributors - MIT LICENSE (Please read LICENSE.txt) |
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https://github.com/julien-boudry/Condorcet |
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*/ |
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declare(strict_types=1); |
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/////////// TOOLS FOR MODULAR ALGORITHMS /////////// |
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namespace CondorcetPHP\Condorcet\Algo\Tools; |
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use CondorcetPHP\Condorcet\Algo\Pairwise; |
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// Generic for Algorithms |
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abstract class PairwiseStats |
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{ |
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public static function PairwiseComparison (Pairwise $pairwise) : array |
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{ |
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$comparison = []; |
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foreach ($pairwise as $candidate_key => $candidate_data) : |
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$comparison[$candidate_key]['win'] = 0; |
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$comparison[$candidate_key]['null'] = 0; |
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$comparison[$candidate_key]['lose'] = 0; |
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$comparison[$candidate_key]['balance'] = 0; |
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$comparison[$candidate_key]['sum_defeat_margin'] = 0; |
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$comparison[$candidate_key]['worst_pairwise_defeat_winning'] = 0; |
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$comparison[$candidate_key]['worst_pairwise_defeat_margin'] = null; |
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$comparison[$candidate_key]['worst_pairwise_opposition'] = 0; |
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foreach ($candidate_data['win'] as $opponentKey => $opponentLose) : |
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$defeat_margin = $candidate_data['lose'][$opponentKey] - $opponentLose; |
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// Worst margin defeat |
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if ($comparison[$candidate_key]['worst_pairwise_defeat_margin'] === null || $comparison[$candidate_key]['worst_pairwise_defeat_margin'] < $defeat_margin) : |
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$comparison[$candidate_key]['worst_pairwise_defeat_margin'] = $defeat_margin; |
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endif; |
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// Worst pairwise opposition |
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View Code Duplication |
if ($comparison[$candidate_key]['worst_pairwise_opposition'] < $candidate_data['lose'][$opponentKey]) : |
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$comparison[$candidate_key]['worst_pairwise_opposition'] = $candidate_data['lose'][$opponentKey]; |
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endif; |
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// for each Win, null, Lose |
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if ( $opponentLose > $candidate_data['lose'][$opponentKey] ) : |
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$comparison[$candidate_key]['win']++; |
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$comparison[$candidate_key]['balance']++; |
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elseif ( $opponentLose === $candidate_data['lose'][$opponentKey] ) : |
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$comparison[$candidate_key]['null']++; |
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else : |
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$comparison[$candidate_key]['lose']++; |
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$comparison[$candidate_key]['balance']--; |
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$comparison[$candidate_key]['sum_defeat_margin'] += $defeat_margin; |
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// Worst winning defeat |
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View Code Duplication |
if ($comparison[$candidate_key]['worst_pairwise_defeat_winning'] < $candidate_data['lose'][$opponentKey]) : |
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$comparison[$candidate_key]['worst_pairwise_defeat_winning'] = $candidate_data['lose'][$opponentKey]; |
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endif; |
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endif; |
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endforeach; |
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endforeach; |
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return $comparison; |
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} |
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} |
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julien-boudry /
Condorcet
