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MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5 (SanFrancisco; 2019-11-05)

🔗 2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5     (tags: { from-bolson , actual , SF , 2019-11 , SanFrancisco_CA , CA , SanFrancisco-2019 , 2019 })

Below is the ABIF from the "2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5" election (MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5 (SanFrancisco; 2019-11-05))

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

Results

🔗https://abif.electorama.com/id/2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5

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 "choose_one". 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
FPTP VALLIE BROWN
Approval VALLIE BROWN
IRV/RCV VALLIE BROWN
STAR VALLIE BROWN
Condorcet/Copeland VALLIE BROWN
Election results summary showing voting method winners
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FPTP result

"FPTP" is "First-past-the-post", also known as "plurality" or "choose-one"
2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5 FPTP results permalink:
🔗https://abif.electorama.com/id/2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5/FPTP#FPTP

  • FPTP Winner: VALLIE BROWN with 11,119 first-place votes (44.9%)
  • Runner-up: DEAN PRESTON with 11,108 first-place votes (44.9%)
  • Margin of victory: 11 votes (0.0 percentage points)
  • First-place votes
    • VALLIE BROWN: 11,119 votes (44.9 %)
    • DEAN PRESTON: 11,108 votes (44.9 %)
    • RYAN LAM: 911 votes (3.7 %)
    • Write-in: 301 votes (1.2 %)
    • NOMVULA O'MEARA: 264 votes (1.1 %)
  • Blanks: 1,062 (4.3 %)
  • Total ballots: 24,765

Approval voting results

2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5 approval voting results permalink:
🔗https://abif.electorama.com/id/2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5/approval#approval
📝
Note — Approvals inferred from choose_one ballots
Details

Approval results are derived by treating each voter's single top choice as their only approval. Lower preferences are not available on choose_one ballots.

  • Approval Winner: VALLIE BROWN
  • Approval Results:
    • VALLIE BROWN — 11,119 approvals (44.9% of ballots) (✅ winner)
    • DEAN PRESTON — 11,108 approvals (44.85% of ballots)
    • RYAN LAM — 911 approvals (3.68% of ballots)
    • Write-in — 301 approvals (1.22% of ballots)
    • NOMVULA O'MEARA — 264 approvals (1.07% of ballots)
  • Total: 24,765 ballots (23,703 total approvals)

IRV/RCV results

2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5 IRV/RCV result permalink:
🔗https://abif.electorama.com/id/2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5/IRV#IRV
📝
Note — IRV/RCV applied to choose_one ballots (no transfers)
Details

These ballots indicate only a single top choice per voter. IRV/RCV on choose_one ballots cannot transfer votes or use lower preferences, so the result is equivalent to plurality on first choices.

  • IRV/RCV Winner: VALLIE BROWN with 11,119 votes (44.9%) in final round
  • Runner-up: DEAN PRESTON with 11,108 votes (44.9%) in final round
  • Exhausted ballots in final round: 2,538 (10.2%)
  • Number of rounds: 4
  • Ballots counted in final round: 22,227 (89.8%)
  • Majority of ballots: 12,383 (50.0%)
  • Total ballots: 24,765
Round 1 Round 2 Round 3 Round 4
Overview:
Active ballots: 24,765 (100.0%)

Exhausted ballots: 1,062 (4.3%)
Counted ballots: 23,703 (95.7%)
Winning threshold: 11,852 (47.86%)
 		Overview:
Active ballots: 24,765 (100.0%)

Exhausted ballots: 1,326 (5.4%)
Counted ballots: 23,439 (94.6%)
Winning threshold: 11,720 (47.32%)
 		Overview:
Active ballots: 24,765 (100.0%)

Exhausted ballots: 1,627 (6.6%)
Counted ballots: 23,138 (93.4%)
Winning threshold: 11,570 (46.72%)
 		Overview:
Active ballots: 24,765 (100.0%)

Exhausted ballots: 2,538 (10.2%)
Counted ballots: 22,227 (89.8%)
Winning threshold: 11,114 (44.88%)
VALLIE BROWN: 11,119 (44.9%)
→
 VALLIE BROWN: 11,119 (44.9%)
→
 VALLIE BROWN: 11,119 (44.9%)
→
 IRV/RCV winner:
VALLIE BROWN: 11,119 (44.9%)✅
→
DEAN PRESTON: 11,108 (44.9%)
→
 DEAN PRESTON: 11,108 (44.9%)
→
 DEAN PRESTON: 11,108 (44.9%)
→
 DEAN PRESTON: 11,108 (44.9%) (🛑eliminated)
→
RYAN LAM: 911 (3.7%)
→
 RYAN LAM: 911 (3.7%)
→
 RYAN LAM: 911 (3.7%) (🛑eliminated)
→
 RYAN LAM
Write-in: 301 (1.2%)
→
 Write-in: 301 (1.2%) (🛑eliminated)
→
 Write-in Write-in
NOMVULA O'MEARA: 264 (1.1%) (🛑eliminated)
→
 NOMVULA O'MEARA NOMVULA O'MEARA NOMVULA O'MEARA

STAR results

2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5 STAR results permalink:
🔗https://abif.electorama.com/id/2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5/STAR#STAR
📝
Note — STAR interpretation from choose_one ballots
Details

Choose_one ballots provide only each voter's top choice and no ratings. STAR results shown here are computed without true ratings and should be interpreted cautiously.

  • STAR winner: VALLIE BROWN
  • Finalists: VALLIE BROWN vs DEAN PRESTON
  • Runoff result:
    • VALLIE BROWN: 11,119 votes (44.9%)
    • DEAN PRESTON: 11,108 votes (44.9%)
    • No preference: 2538 voters (10.2%)
  • Total stars allocated: 94,812
  • Total ballots: 24,765
★★★★★★

★★★★★

★★★★★★
★★★★★
★★★★★★
★★★★★
★★★★★★
★★★★★
★★★★★★
(one star above is approximately 1,896 stars allocated by voters)
  • First round:
    • ★#0: VALLIE BROWN received 44,476 stars (46.9%) from 11,119 voters (44.9%)
    • ★#1: DEAN PRESTON received 44,432 stars (46.9%) from 11,108 voters (44.9%)
    • ★#2: RYAN LAM received 3,644 stars (3.8%) from 911 voters (3.7%)
    • ★#3: Write-in received 1,204 stars (1.3%) from 301 voters (1.2%)
    • ★#4: NOMVULA O'MEARA received 1,056 stars (1.1%) from 264 voters (1.1%)
  • Finalists:
    • ★VALLIE BROWN (✅ winner) preferred by 11,119 of 24,765 voters
    • ★DEAN PRESTON preferred by 11,108 of 24,765 voters
    • ★No preference between the finalists: 2538

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

Condorcet/Copeland results

2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5 Condorcet/Copeland results permalink:
🔗https://abif.electorama.com/id/2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5/pairwise#pairwise
📝
Note — Pairwise comparisons derived from top-choice-only ballots
Details

Pairwise/Condorcet comparisons use only each voter's top choice from choose_one ballots. No lower preferences are available, so many matchups will show a large 'No preference' count.

  • Winner: VALLIE BROWN
  • Runner-up: DEAN PRESTON (beats all other candidates except VALLIE BROWN)
  • Smallest margin: Write-in over NOMVULA O'MEARA (301-264; margin: 37)
  • Largest margin: VALLIE BROWN over Write-in (11,119-301; margin: 10,818)
  • Pairwise ties: none
  • Total ballots: 24,765

Win-loss-tie (Condorcet/Copeland) table

2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5 w-l-t table permalink:
🔗https://abif.electorama.com/id/2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5/pairwise#wlt
MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5 (SanFrancisco; 2019-11-05) pairwise matchups
VALLIE BROWN
(4-0-0)
VALLIE BROWN
4 victories ⇣
DEAN PRESTON
(3-1-0)
VALLIE BROWN: 11,119(44.9%)
DEAN PRESTON: 11,108(44.9%)
(No preference: 2,538; 10.2%)
DEAN PRESTON
⇽ 1 loss / 3 victories† ⇣
RYAN LAM
(2-2-0)
VALLIE BROWN: 11,119(44.9%)
RYAN LAM: 911(3.7%)
(No preference: 12,735; 51.4%)
DEAN PRESTON: 11,108(44.9%)
RYAN LAM: 911(3.7%)
(No preference: 12,746; 51.5%)
RYAN LAM
⇽ 2 losses / 2 victories† ⇣
Write-in
(1-3-0)
VALLIE BROWN: 11,119(44.9%)
Write-in: 301(1.2%)
(No preference: 13,345; 53.9%)
DEAN PRESTON: 11,108(44.9%)
Write-in: 301(1.2%)
(No preference: 13,356; 53.9%)
RYAN LAM: 911(3.7%)
Write-in: 301(1.2%)
(No preference: 23,553; 95.1%)
Write-in
⇽ 3 losses / 1 victory† ⇣
NOMVULA O'MEARA
(0-4-0)
VALLIE BROWN: 11,119(44.9%)
NOMVULA O'MEARA: 264(1.1%)
(No preference: 13,382; 54.0%)
DEAN PRESTON: 11,108(44.9%)
NOMVULA O'MEARA: 264(1.1%)
(No preference: 13,393; 54.1%)
RYAN LAM: 911(3.7%)
NOMVULA O'MEARA: 264(1.1%)
(No preference: 23,590; 95.3%)
Write-in: 301(1.2%)
NOMVULA O'MEARA: 264(1.1%)
(No preference: 24,200; 97.7%)

Pairwise tournament (Copeland ordered)

2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5 pairwise diagram permalink:
🔗https://abif.electorama.com/id/2019-11-05_SanFrancisco-MEMBER_BOARD_OF_SUPERVISORS_DISTRICT_5/pairwise#dot

%3 VALLIE BROWN VALLIE BROWN 4-0-0 (4 wins, 0 losses, 0 ties) DEAN PRESTON DEAN PRESTON 3-1-0 VALLIE BROWN->DEAN PRESTON ← VALLIE BROWN: 11119 DEAN PRESTON: 11108 RYAN LAM RYAN LAM 2-2-0 VALLIE BROWN->RYAN LAM ← VALLIE BROWN: 11119 RYAN LAM: 911 Write-in Write-in 1-3-0 VALLIE BROWN->Write-in ← VALLIE BROWN: 11119 Write-in: 301 NOMVULA O'MEARA NOMVULA O'MEARA 0-4-0 VALLIE BROWN->NOMVULA O'MEARA ← VALLIE BROWN: 11119 NOMVULA O'MEARA: 264 DEAN PRESTON->RYAN LAM ← DEAN PRESTON: 11108 RYAN LAM: 911 DEAN PRESTON->Write-in ← DEAN PRESTON: 11108 Write-in: 301 DEAN PRESTON->NOMVULA O'MEARA ← DEAN PRESTON: 11108 NOMVULA O'MEARA: 264 RYAN LAM->Write-in ← RYAN LAM: 911 Write-in: 301 RYAN LAM->NOMVULA O'MEARA ← RYAN LAM: 911 NOMVULA O'MEARA: 264 Write-in->NOMVULA O'MEARA ← Write-in: 301 NOMVULA O'MEARA: 264

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

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