BV parity — Approval: most approvals wins (single winner)¶

Generated from BV_Library_approval_single_winner.yaml — do not edit by hand. Regenerate: python STARVote_LH_tabulation_engine/tools_adam/scripts/build_yaml_pages.py.

Method: Approval Voting · 1 seat · Expected winner: Dave

Scenario¶

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.

Ballots¶

Row 1 = candidate names; each later row is one voter's approvals (1 = approve, 0/blank = not approved).

Markers on these ballots: - blank · ~ race abstention · & candidate abstention · ? spoiled · % spoiled+reissued — all tabulate as 0 (reported honestly).

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

What the engine says¶

Full report from the _tabulated mirror (regenerated on every run; every analysis forced on):

--- 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

Run it yourself:

python STARVote_LH_tabulation_engine/starvote_larry_hastings.py method_comparisons/BV_Library/cases/BV_Library_approval_single_winner.yaml

BV parity — Approval: most approvals wins (single winner)¶

Scenario¶

Ballots¶

What the engine says¶

See also¶