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Board of Supervisors District 3 (SanFrancisco; 2016-11-06)

🔗 2016-11-06_SanFrancisco-Board_of_Supervisors_District_3     (tags: { from-bolson , actual , SF , SanFrancisco_CA , 2016 , 2016-11 , CA , SanFrancisco-2016 })

Below is the ABIF from the "2016-11-06_SanFrancisco-Board_of_Supervisors_District_3" election (Board of Supervisors District 3 (SanFrancisco; 2016-11-06))

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Voting methods: IRV • FPTP • approval • STAR • Pairwise • All methods

Results

🔗https://abif.electorama.com/id/2016-11-06_SanFrancisco-Board_of_Supervisors_District_3

Below are the results of the election represented above using various election methods with abiftool/abiflib. The detected ballot type from the ABIF above is "ranked". Some methods may transform these ballots for analysis; see method notices for details. Resubmit the ABIF with "Transform ballots" turned off to minimize the transformations.

Method Winner
IRV/RCV AARON PESKIN
FPTP AARON PESKIN
Approval AARON PESKIN
STAR AARON PESKIN
Condorcet/Copeland AARON PESKIN
Election results summary showing voting method winners
click/tap to expand
tabbed view

IRV/RCV results

2016-11-06_SanFrancisco-Board_of_Supervisors_District_3 IRV/RCV result permalink:
🔗https://abif.electorama.com/id/2016-11-06_SanFrancisco-Board_of_Supervisors_District_3/IRV#IRV

  • IRV/RCV Winner: AARON PESKIN with 18,999 votes (60.3%) in final round
  • Runner-up: TIM E. DONNELLY with 7,668 votes (24.3%) in final round
  • Exhausted ballots in final round: 4,854 (15.4%)
  • Number of rounds: 1
  • Ballots counted in final round: 26,667 (84.6%)
  • Majority of ballots: 15,761 (50.0%)
  • Total ballots: 31,521
Round 1
Overview:
Active ballots: 31,521 (100.0%)

Exhausted ballots: 4,854 (15.4%)
Counted ballots: 26,667 (84.6%)
Winning threshold: 13,334 (42.30%)
IRV/RCV winner:
AARON PESKIN: 18,999 (60.3%)✅
→
TIM E. DONNELLY: 7,668 (24.3%) (🛑eliminated)
→

FPTP result

"FPTP" is "First-past-the-post", also known as "plurality" or "choose-one"
2016-11-06_SanFrancisco-Board_of_Supervisors_District_3 FPTP results permalink:
🔗https://abif.electorama.com/id/2016-11-06_SanFrancisco-Board_of_Supervisors_District_3/FPTP#FPTP
📝
Note — Only using first-choices on ranked ballots

  • FPTP Winner: AARON PESKIN with 18,999 first-place votes (60.3%)
  • Runner-up: TIM E. DONNELLY with 7,668 first-place votes (24.3%)
  • Margin of victory: 11,331 votes (35.9 percentage points)
  • First-place votes
    • AARON PESKIN: 18,999 votes (60.3 %)
    • TIM E. DONNELLY: 7,668 votes (24.3 %)
  • Blanks: 4,854 (15.4 %)
  • Total ballots: 31,521

Approval voting results

2016-11-06_SanFrancisco-Board_of_Supervisors_District_3 approval voting results permalink:
🔗https://abif.electorama.com/id/2016-11-06_SanFrancisco-Board_of_Supervisors_District_3/approval#approval
📝
Note — Approval counts estimated from 31,521 ranked ballots using favorite_viable_half method
Details

The 'favorite_viable_half' conversion algorithm: find the candidate with the most first preferences, and then determine the minimum number of figurative seats that would need to be open in order for the candidate to exceed the Hare quota with the given first-prefs. We use this to estimate how many candidates are likely to be viable candidates.

Using first-choice vote totals as a rough guide, approximately 2 candidates appear viable: AARON PESKIN and TIM E. DONNELLY. The approximation then assumes each voter approves up to 1 of their top-ranked viable candidates (half of 2). All candidates ranked at or above the lowest-ranked of each ballot's top viable candidates receive approval (considering up to 1 viable candidates per ballot).

See transformed ballots

Note: For Approval, these choose_many ballots are inferred from ranked ballots.

Conversion method: favorite_viable_half

#------- metadata -------
{ballotcount: 31521}
{version: "0.1"}
{ballotcount_abif_metadata: "31521"}
{is_ranking_to_rating: true}
#------ candlines ------
=[AARON PESKIN]:[AARON PESKIN]
=[TIM E. DONNELLY]:[TIM E. DONNELLY]
#------- votelines ------
8295:[AARON PESKIN]/1
6517:[AARON PESKIN]/1
3202:[AARON PESKIN]/1
2780:[TIM E. DONNELLY]/1
2745:[TIM E. DONNELLY]/1
1298:[TIM E. DONNELLY]/1
532:[TIM E. DONNELLY]/1
446:[AARON PESKIN]/1
284:[AARON PESKIN]/1
255:[AARON PESKIN]/1
210:[TIM E. DONNELLY]/1
103:[TIM E. DONNELLY]/1
  • Approval Winner: AARON PESKIN
  • Approval Results:
    • AARON PESKIN — 18,999 approvals (60.27% of ballots) (✅ winner)
    • TIM E. DONNELLY — 7,668 approvals (24.33% of ballots)
  • Total: 31,521 ballots (26,667 total approvals)

STAR results

2016-11-06_SanFrancisco-Board_of_Supervisors_District_3 STAR results permalink:
🔗https://abif.electorama.com/id/2016-11-06_SanFrancisco-Board_of_Supervisors_District_3/STAR#STAR
📝
Note — STAR ratings estimated from ranked ballots using Borda scoring method
Details

The ranked ballots have been converted to STAR ratings using Borda scoring: each candidate receives points equal to (number_of_candidates - their_rank). In this election, we have 2 candidates, so the 1st choice gets 1 points, the 2nd choice gets 0 points, etc. These Borda scores are then used as STAR ratings for tabulation by STAR.

  • STAR winner: AARON PESKIN
  • Finalists: AARON PESKIN vs TIM E. DONNELLY
  • Runoff result:
    • AARON PESKIN: 18,999 votes (60.3%)
    • TIM E. DONNELLY: 7,668 votes (24.3%)
    • No preference: 4854 voters (15.4%)
  • Total stars allocated: 26,667
  • Total ballots: 31,521
★★★★★★

★★★★★

★★★★★★
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(one star above is approximately 533 stars allocated by voters)
  • First round:
    • ★#0: AARON PESKIN received 18,999 stars (71.2%) from 18,999 voters (60.3%)
    • ★#1: TIM E. DONNELLY received 7,668 stars (28.8%) from 7,668 voters (24.3%)
  • Finalists:
    • ★AARON PESKIN (✅ winner) preferred by 18,999 of 31,521 voters
    • ★TIM E. DONNELLY preferred by 7,668 of 31,521 voters
    • ★No preference between the finalists: 4854

NOTE: Since ratings or stars are not present in the provided ballots, allocated stars are estimated using a Borda-like formula.

Condorcet/Copeland results

2016-11-06_SanFrancisco-Board_of_Supervisors_District_3 Condorcet/Copeland results permalink:
🔗https://abif.electorama.com/id/2016-11-06_SanFrancisco-Board_of_Supervisors_District_3/pairwise#pairwise
  • Winner: AARON PESKIN
  • Runner-up: TIM E. DONNELLY (beats all other candidates except AARON PESKIN)
  • Smallest margin: AARON PESKIN over TIM E. DONNELLY (18,999-7,668; margin: 11,331)
  • Largest margin: AARON PESKIN over TIM E. DONNELLY (18,999-7,668; margin: 11,331)
  • Pairwise ties: none
  • Total ballots: 31,521

Win-loss-tie (Condorcet/Copeland) table

2016-11-06_SanFrancisco-Board_of_Supervisors_District_3 w-l-t table permalink:
🔗https://abif.electorama.com/id/2016-11-06_SanFrancisco-Board_of_Supervisors_District_3/pairwise#wlt
Board of Supervisors District 3 (SanFrancisco; 2016-11-06) pairwise matchups
AARON PESKIN
(1-0-0)
AARON PESKIN
1 victory ⇣
TIM E. DONNELLY
(0-1-0)
AARON PESKIN: 18,999(60.3%)
TIM E. DONNELLY: 7,668(24.3%)
(No preference: 4,854; 15.4%)

Pairwise tournament (Copeland ordered)

2016-11-06_SanFrancisco-Board_of_Supervisors_District_3 pairwise diagram permalink:
🔗https://abif.electorama.com/id/2016-11-06_SanFrancisco-Board_of_Supervisors_District_3/pairwise#dot

%3 AARON PESKIN AARON PESKIN 1-0-0 (1 wins, 0 losses, 0 ties) TIM E. DONNELLY TIM E. DONNELLY 0-1-0 AARON PESKIN->TIM E. DONNELLY ← AARON PESKIN: 18999 TIM E. DONNELLY: 7668

Voting methods: IRV • FPTP • approval • STAR • Pairwise • All methods

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