Anti-Harassment Tools/SecurePoll Improvements/Test Results/20 6 5000 2048723651

Comments

Case: All but two seats filled, rest of candidates hopeful. 2nd preferences transferred to candidate 17. 3rd preferences transferred to candidate 9.

SecurePoll and OpenSTV agree on winning candidates.

Election setup

• Candidates: 20
• Seats: 6
• Votes: 5000

Actual

Output from SecurePoll (var_dump( $this->tallier->resultsLog );): https://phabricator.wikimedia.org/P16851

Actual tally: SP 3.0.0 (58bf4c8)

Elected

Election for 6 seats with 20 candidates. Total 5,000 votes.

1. "2"
2. "4"
3. "6"
4. "8"
5. "17"
6. "9"

Eliminated/Not elected

• "10"
• "5"
• "12"
• "13"
• "14"
• "15"
• "16"
• "18"
• "19"
• "20"
• "1"
• "11"
• "3"
• "7"

Rounds table

The following table describes the calculations that happened in order to achieve the result above. In each round of calculation, the candidate(s) who achieved more votes than the quota are declared elected. Their surplus votes above the quota are redistributed to the remaining candidates. If nobody achieves the quota, the lowest ranking candidate is eliminated and their votes are redistributed to the remaining candidates. To understand this better, please refer to this link.

Round Number	Tally	Result
1	"8": 985 "4": 985 "6": 985 "2": 984 "1": 67 "9": 67 "11": 67 "7": 67 "3": 67 "5": 66 "10": 66 "12": 66 "13": 66 "14": 66 "15": 66 "16": 66 "17": 66 "18": 66 "19": 66 "20": 66	Quota: 714.285715
2	"8": 985 "4": 985 "6": 985 "2": 984 "1": 67 "9": 67 "11": 67 "7": 67 "3": 67 "5": 66 "10": 66 "12": 66 "13": 66 "14": 66 "15": 66 "16": 66 "17": 66 "18": 66 "19": 66 "20": 66	Quota: 714.285715 Elected: "2", "4", "6", "8"
3	"17": 66 - 65 = 1,147.857139 "8": 985 - 270.714285 = 714.285715 (keep factor: 0.725163) "4": 985 - 270.714285 = 714.285715 (keep factor: 0.725163) "2": 984 - 269.714285 = 714.285715 (keep factor: 0.725900) "6": 985 - 270.714285 = 714.285715 (keep factor: 0.725163) "1": 67 "9": 67 "11": 67 "3": 67 "7": 67 "10": 66 "5": 66 "12": 66 "13": 66 "14": 66 "15": 66 "16": 66 "18": 66 "19": 66 "20": 66	Quota: 714.285715 Elected: "17" Transferring votes
4	"8": 714.285715 (keep factor: 0.725163) "4": 714.285715 (keep factor: 0.725163) "6": 714.285715 (keep factor: 0.725163) "17": 1,147.857139 + 713.285715 = 714.285715 (keep factor: 0.622278) "2": 714.285715 (keep factor: 0.725900) "9": 67 + 408.641741 = 475.641741 "1": 67 "11": 67 "3": 67 "7": 67 "10": 66 "5": 66 "12": 66 "13": 66 "14": 66 "15": 66 "16": 66 "18": 66 "19": 66 "20": 66	Quota: 710.724332 Transferring votes
5	"17": 714.285715 + 5.259093 = 719.544808 (keep factor: 0.619175) "2": 714.285715 - 3.561383 = 710.724332 (keep factor: 0.722281) "8": 714.285715 - 3.561383 = 710.724332 (keep factor: 0.721548) "4": 714.285715 - 3.561383 = 710.724332 (keep factor: 0.721548) "6": 714.285715 - 3.561383 = 710.724332 (keep factor: 0.721548) "9": 475.641741 + 8.781666 = 484.423407 "1": 67 "11": 67 "3": 67 "7": 67 "10": 66 "5": 66 "12": 66 "13": 66 "14": 66 "15": 66 "16": 66 "18": 66 "19": 66 "20": 66	Quota: 710.695079 Transferring votes
6	"17": 719.544808 - 8.778168 = 710.766640 (keep factor: 0.611560) "8": 710.724332 - 0.029253 = 710.695079 (keep factor: 0.721518) "4": 710.724332 - 0.029253 = 710.695079 (keep factor: 0.721518) "6": 710.724332 - 0.029253 = 710.695079 (keep factor: 0.721518) "2": 710.724332 - 0.029253 = 710.695079 (keep factor: 0.722251) "9": 484.423407 + 8.392574 = 492.815981 "1": 67 "11": 67 "3": 67 "7": 67 "10": 66 "5": 66 "12": 66 "13": 66 "14": 66 "15": 66 "16": 66 "18": 66 "19": 66 "20": 66	Quota: 710.623278 Eliminated: "10", "5", "12", "13", "14", "15", "16", "18", "19", "20" Transferring votes
7	"17": 710.766640 + 201.806216 = 912.572856 (keep factor: 0.611436) "8": 710.695079 - 0.071801 = 710.623278 (keep factor: 0.721445) "4": 710.695079 - 0.071801 = 710.623278 (keep factor: 0.721445) "2": 710.695079 - 0.071801 = 710.623278 (keep factor: 0.722178) "6": 710.695079 - 0.071801 = 710.623278 (keep factor: 0.721445) "9": 492.815981 + 128.472847 = 621.288828 "1": 67 "11": 67 "3": 67 "7": 67	Quota: 663.479257 Eliminated: "1", "11", "3", "7" Transferring votes
8	"9": 621.288828 + 342.824894 = 964.113722 "17": 912.572856 - 165.263957 = 747.308899 (keep factor: 0.444540) "4": 710.623278 - 47.144021 = 663.479257 (keep factor: 0.673583) "6": 710.623278 - 47.144021 = 663.479257 (keep factor: 0.673583) "8": 710.623278 - 47.144021 = 663.479257 (keep factor: 0.673583) "2": 710.623278 - 47.144021 = 663.479257 (keep factor: 0.674268)	Quota: 623.619951 Elected: "9" Transferring votes

(Results from 14:17, 31 August 2021)

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Expected

Output from OpenSTV: https://phabricator.wikimedia.org/P16852

Files

• blt: https://github.com/dominic998/SecurePoll-Test-Data/blob/main/test_data/20_6_5000_2048723651.blt
• php:

array (
  '15_17_9' => 
  array (
    'count' => 66,
    'rank' => 
    array (
      1 => 15,
      2 => 17,
      3 => 9,
    ),
  ),
  '4_17_9' => 
  array (
    'count' => 985,
    'rank' => 
    array (
      1 => 4,
      2 => 17,
      3 => 9,
    ),
  ),
  '8_17_9' => 
  array (
    'count' => 985,
    'rank' => 
    array (
      1 => 8,
      2 => 17,
      3 => 9,
    ),
  ),
  9 => 
  array (
    'count' => 67,
    'rank' => 
    array (
      1 => 9,
    ),
  ),
  '2_17_9' => 
  array (
    'count' => 984,
    'rank' => 
    array (
      1 => 2,
      2 => 17,
      3 => 9,
    ),
  ),
  20 => 
  array (
    'count' => 66,
    'rank' => 
    array (
      1 => 20,
    ),
  ),
  '12_17_9' => 
  array (
    'count' => 66,
    'rank' => 
    array (
      1 => 12,
      2 => 17,
      3 => 9,
    ),
  ),
  11 => 
  array (
    'count' => 67,
    'rank' => 
    array (
      1 => 11,
    ),
  ),
  18 => 
  array (
    'count' => 66,
    'rank' => 
    array (
      1 => 18,
    ),
  ),
  '19_17_9' => 
  array (
    'count' => 66,
    'rank' => 
    array (
      1 => 19,
      2 => 17,
      3 => 9,
    ),
  ),
  '5_17_9' => 
  array (
    'count' => 66,
    'rank' => 
    array (
      1 => 5,
      2 => 17,
      3 => 9,
    ),
  ),
  16 => 
  array (
    'count' => 66,
    'rank' => 
    array (
      1 => 16,
    ),
  ),
  13 => 
  array (
    'count' => 66,
    'rank' => 
    array (
      1 => 13,
    ),
  ),
  '10_17_9' => 
  array (
    'count' => 66,
    'rank' => 
    array (
      1 => 10,
      2 => 17,
      3 => 9,
    ),
  ),
  17 => 
  array (
    'count' => 66,
    'rank' => 
    array (
      1 => 17,
    ),
  ),
  3 => 
  array (
    'count' => 67,
    'rank' => 
    array (
      1 => 3,
    ),
  ),
  7 => 
  array (
    'count' => 67,
    'rank' => 
    array (
      1 => 7,
    ),
  ),
  '6_17_9' => 
  array (
    'count' => 985,
    'rank' => 
    array (
      1 => 6,
      2 => 17,
      3 => 9,
    ),
  ),
  1 => 
  array (
    'count' => 67,
    'rank' => 
    array (
      1 => 1,
    ),
  ),
  14 => 
  array (
    'count' => 66,
    'rank' => 
    array (
      1 => 14,
    ),
  ),
)

Environment

• Where you tested: local docker using phpunit
• Version of SecurePoll: commit 271145d5f3cae3b0a1b76d0f5dfeb609615d60b7 (patch 16 from https://gerrit.wikimedia.org/r/c/mediawiki/extensions/SecurePoll/+/704454/)