BV2133 — Pet poll II (RCV-IRV): transfers elect Fish¶

Generated from bv2133_dyxrbr_pet2_irv.yaml — do not edit by hand. Regenerate: python STARVote_LH_tabulation_engine/tools_adam/scripts/build_yaml_pages.py.

Method: RCV-IRV (Instant Runoff) · 1 seat · Expected winner: Fish

▶ Live on BetterVoting: vote · results ↗ (election dyxrbr · test BV2133).

Scenario¶

One of four races in the BV2133 "Pet poll II" (BetterVoting election dyxrbr). RCV-IRV (ranked, instant runoff). Round 1: Dog 13, Fish 10, Bird 9 — eliminate Bird; Bird > Cat, so Cat rises. Then Cat (fewest) is eliminated and its ballots flow to Fish, which beats Dog 19-13. So IRV elects Fish. Same electorate as the Plurality race (Dog), Approval race (Bird) and STAR race (Cat): four methods, four winners. BV also elects Fish. Live results: https://bettervoting.com/dyxrbr/results

Ballots¶

Each row is one voter's ranking, most-preferred first (N: prefix = N identical ballots).

9:Bird>Cat>Fish>Dog
10:Fish>Cat>Bird>Dog
13:Dog>Cat>Fish>Bird

What the engine says¶

Round-by-round Sankey diagram: each candidate's votes as a band, and where the votes of an eliminated candidate transferred to.

Where the votes went. Band thickness is votes; a band leaving an eliminated candidate lands on whoever that ballot ranked next, or on inactive if it ranked nobody who was left.

The count, step by step — the rounds and how the winner is reached:

--- RCV / Instant-Runoff Voting (single winner) ---
  BV2133 — Pet poll II (RCV-IRV): transfers elect Fish
 Tabulating 32 ballots (ranked ballots).

ROUND 1
Candidate      Votes  Status
-----------  -------  --------
Dog               13  Hopeful
Fish              10  Hopeful
Bird               9  Rejected
Cat                0  Rejected

FINAL RESULT
Candidate      Votes  Status
-----------  -------  --------
Fish              19  Elected
Dog               13  Rejected
Bird               0  Rejected
Cat                0  Rejected


Winner(s) — RCV / Instant-Runoff Voting (single winner)
  Fish

Full audit — preference matrix, Condorcet, and score distribution¶

--- Smith Set (the generalized Condorcet winner) ---
The smallest group whose every member beats every candidate outside it —
the honest answer to "who is even in contention?".
   Smith set (1 of 4): Cat
   Outside (3):        Bird, Fish, Dog
   One member ⇒ Cat is the Condorcet winner, beating every rival head-to-head.
   RCV-IRV winner Fish is OUTSIDE the Smith set. ✗
      Every member of the set (Cat) beats Fish head-to-head, yet
      RCV-IRV elected Fish anyway. RCV-IRV is not Smith-efficient (nor
      Condorcet-efficient) — this is the shape a center squeeze leaves behind.
   More: 07_Concepts/topics/smith_set.md

Everything in one file: the _tabulated mirror (regenerated on every run; every analysis forced on).

Run it yourself:

python STARVote_LH_tabulation_engine/starvote_larry_hastings.py method_comparisons/pet_poll_four_winners/cases/bv2133_dyxrbr_pet2_irv.yaml

BV2133 — Pet poll II (RCV-IRV): transfers elect Fish¶

Scenario¶

Ballots¶

What the engine says¶

Full audit — preference matrix, Condorcet, and score distribution¶

See also¶