======================================================================
SOURCE FILE:     BV_Library_approval_single_winner.yaml
TABULATED FILE:  BV_Library_approval_single_winner_tabulated.txt
======================================================================

election_title: "BV parity — Approval: most approvals wins (single winner)"
scenario_description: |-
  Ported from BetterVoting's tabulator unit tests (Approval.test.ts :: "Single Winner Test").
  Dave has the most approvals and wins. In the original two rows carried out-of-bounds
  marks (a 2 and a -1) that BetterVoting counts as 0/not-approved; here they are written
  as plain 0 so the file validates under this engine while preserving every approval total.

num_winners: 1
voting_method: Approval
ballots: |-
  Alice,Bob,Carol,Dave
  1,1,1,1
  0,1,1,1
  0,1,1,1
  0,0,1,1
  0,0,1,1
  0,0,1,1
  0,0,0,1
  -,-,-,-
  0,0,0,0
  0,0,0,0

expected_winners:
  - Dave

# file: BV_Library_approval_single_winner.yaml

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TABULATION RESULTS
======================================================================

--- Approval Voting (single winner) ---
 Tabulating 10 ballots (any non-zero score = approval).
 Abstentions: 3 of 10 ballots approved no one (7 ballots cast an approval).

Ballots:
   columns = Alice, Bob, Carol, Dave      (1 = approve; 0 = not approved)
     1 × 1,1,1,1
     2 × 0,1,1,1
     3 × 0,0,1,1
     1 × 0,0,0,1
     3 × 0,0,0,0

[Legend] (these all count as not approved — the echo above shows them as 0)
  -  Blank — no score / voter left the candidate blank

   Dave  -- 7 (70%) -- Elected
   Carol -- 6 (60%)
   Bob   -- 3 (30%)
   Alice -- 1 (10%)

[Approval Distribution] (how many candidates each ballot approved)
   17 approvals across 10 ballots — average 1.7 of 4 (range 0–4).
     approved none: 3 ballots
     approved 1: 1 ballot
     approved 2: 3 ballots
     approved 3: 2 ballots
     approved 4: 1 ballot

[Co-Approval Matrix]
 Of the voters who approved the ROW candidate, the % who ALSO approved the COLUMN candidate.
          |  Dave  | Carol  |  Bob   | Alice  |
   --------------------------------------------
   Dave   |   --   |  86%   |  43%   |  14%   |
   Carol  |  100%  |   --   |  50%   |  17%   |
   Bob    |  100%  |  100%  |   --   |  33%   |
   Alice  |  100%  |  100%  |  100%  |   --   |

Winner — Approval Voting (single winner)
  Dave