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Board of Supervisors District 8 (SF_Mayor; 2018-06-05)

🔗 2018-06-05_SF_Mayor-Board_of_Supervisors_District_8     (tags: { 2018-06 , from-bolson , actual , 2018 , SF_Mayor , mayor , SF_Mayor-2018 , CA })

Below is the ABIF from the "2018-06-05_SF_Mayor-Board_of_Supervisors_District_8" election (Board of Supervisors District 8 (SF_Mayor; 2018-06-05))

ABIF submission area (show)
Method options
Ballot options

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

Results

🔗https://abif.electorama.com/id/2018-06-05_SF_Mayor-Board_of_Supervisors_District_8

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 RAFAEL MANDELMAN
FPTP RAFAEL MANDELMAN
Approval RAFAEL MANDELMAN
STAR RAFAEL MANDELMAN
Condorcet/Copeland RAFAEL MANDELMAN
Election results summary showing voting method winners
click/tap to expand
tabbed view

IRV/RCV results

2018-06-05_SF_Mayor-Board_of_Supervisors_District_8 IRV/RCV result permalink:
🔗https://abif.electorama.com/id/2018-06-05_SF_Mayor-Board_of_Supervisors_District_8/IRV#IRV

  • IRV/RCV Winner: RAFAEL MANDELMAN with 19,953 votes (55.3%) in final round
  • Runner-up: JEFF SHEEHY with 12,701 votes (35.2%) in final round
  • Exhausted ballots in final round: 2,792 (7.7%)
  • Number of rounds: 1
  • Ballots counted in final round: 33,275 (92.3%)
  • Majority of ballots: 18,034 (50.0%)
  • Total ballots: 36,067
Round 1
Overview:
Active ballots: 36,067 (100.0%)

Exhausted ballots: 2,792 (7.7%)
Counted ballots: 33,275 (92.3%)
Winning threshold: 16,638 (46.13%)
IRV/RCV winner:
RAFAEL MANDELMAN: 19,953 (55.3%)✅
→
JEFF SHEEHY: 12,701 (35.2%) (🛑eliminated)
→
LAWRENCE ''STARK'' DAGESSE: 621 (1.7%) (🛑eliminated)
→

FPTP result

"FPTP" is "First-past-the-post", also known as "plurality" or "choose-one"
2018-06-05_SF_Mayor-Board_of_Supervisors_District_8 FPTP results permalink:
🔗https://abif.electorama.com/id/2018-06-05_SF_Mayor-Board_of_Supervisors_District_8/FPTP#FPTP
📝
Note — Only using first-choices on ranked ballots

  • FPTP Winner: RAFAEL MANDELMAN with 19,953 first-place votes (55.3%)
  • Runner-up: JEFF SHEEHY with 12,701 first-place votes (35.2%)
  • Margin of victory: 7,252 votes (20.1 percentage points)
  • First-place votes
    • RAFAEL MANDELMAN: 19,953 votes (55.3 %)
    • JEFF SHEEHY: 12,701 votes (35.2 %)
    • LAWRENCE ''STARK'' DAGESSE: 621 votes (1.7 %)
  • Blanks: 2,792 (7.7 %)
  • Total ballots: 36,067

Approval voting results

2018-06-05_SF_Mayor-Board_of_Supervisors_District_8 approval voting results permalink:
🔗https://abif.electorama.com/id/2018-06-05_SF_Mayor-Board_of_Supervisors_District_8/approval#approval
📝
Note — Approval counts estimated from 36,067 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: RAFAEL MANDELMAN and JEFF SHEEHY. 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: 36067}
{version: "0.1"}
{ballotcount_abif_metadata: "36067"}
{is_ranking_to_rating: true}
#------ candlines ------
=[RAFAEL MANDELMAN]:[RAFAEL MANDELMAN]
=[JEFF SHEEHY]:[JEFF SHEEHY]
=[LAWRENCE ''STARK'' DAGESSE]:[LAWRENCE ''STARK'' DAGESSE]
#------- votelines ------
6060:[RAFAEL MANDELMAN]/1
5507:[RAFAEL MANDELMAN]/1
5040:[RAFAEL MANDELMAN]/1
4126:[JEFF SHEEHY]/1
3340:[JEFF SHEEHY]/1
2853:[JEFF SHEEHY]/1
1606:[RAFAEL MANDELMAN]/1
1212:[JEFF SHEEHY]/1
806:[RAFAEL MANDELMAN]/1
524:[RAFAEL MANDELMAN]/1
467:[JEFF SHEEHY]/1
358:[JEFF SHEEHY]/1
212:[LAWRENCE ''STARK'' DAGESSE]/1=[RAFAEL MANDELMAN]/1
196:[JEFF SHEEHY]/1
191:[RAFAEL MANDELMAN]/1
172:[JEFF SHEEHY]/1=[LAWRENCE ''STARK'' DAGESSE]/1
89:[RAFAEL MANDELMAN]/1
80:[RAFAEL MANDELMAN]/1
68:[JEFF SHEEHY]/1
53:[JEFF SHEEHY]/1
44:[LAWRENCE ''STARK'' DAGESSE]/1=[RAFAEL MANDELMAN]/1
28:[LAWRENCE ''STARK'' DAGESSE]/1=[RAFAEL MANDELMAN]/1
28:[RAFAEL MANDELMAN]/1
25:[JEFF SHEEHY]/1=[LAWRENCE ''STARK'' DAGESSE]/1
22:[RAFAEL MANDELMAN]/1
14:[JEFF SHEEHY]/1
14:[JEFF SHEEHY]/1
9:[JEFF SHEEHY]/1=[LAWRENCE ''STARK'' DAGESSE]/1
6:[JEFF SHEEHY]/1=[LAWRENCE ''STARK'' DAGESSE]/1
5:[LAWRENCE ''STARK'' DAGESSE]/1=[RAFAEL MANDELMAN]/1
  • Approval Winner: RAFAEL MANDELMAN
  • Approval Results:
    • RAFAEL MANDELMAN — 20,242 approvals (56.12% of ballots) (✅ winner)
    • JEFF SHEEHY — 12,913 approvals (35.8% of ballots)
    • LAWRENCE ''STARK'' DAGESSE — 501 approvals (1.39% of ballots)
  • Total: 36,067 ballots (33,656 total approvals)

STAR results

2018-06-05_SF_Mayor-Board_of_Supervisors_District_8 STAR results permalink:
🔗https://abif.electorama.com/id/2018-06-05_SF_Mayor-Board_of_Supervisors_District_8/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 3 candidates, so the 1st choice gets 2 points, the 2nd choice gets 1 points, etc. These Borda scores are then used as STAR ratings for tabulation by STAR.

  • STAR winner: RAFAEL MANDELMAN
  • Finalists: RAFAEL MANDELMAN vs JEFF SHEEHY
  • Runoff result:
    • RAFAEL MANDELMAN: 20,242 votes (56.1%)
    • JEFF SHEEHY: 12,913 votes (35.8%)
    • No preference: 2912 voters (8.1%)
  • Total stars allocated: 88,899
  • Total ballots: 36,067
★★★★★★

★★★★★

★★★★★★
★★★★★
★★★★★★
★★★★★
★★★★★★
★★★★★
★★★★★★
(one star above is approximately 1,778 stars allocated by voters)
  • First round:
    • ★#0: RAFAEL MANDELMAN received 47,438 stars (53.4%) from 27,485 voters (76.2%)
    • ★#1: JEFF SHEEHY received 36,441 stars (41.0%) from 23,740 voters (65.8%)
    • ★#2: LAWRENCE ''STARK'' DAGESSE received 5,020 stars (5.6%) from 4,399 voters (12.2%)
  • Finalists:
    • ★RAFAEL MANDELMAN (✅ winner) preferred by 20,242 of 36,067 voters
    • ★JEFF SHEEHY preferred by 12,913 of 36,067 voters
    • ★No preference between the finalists: 2912

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

Condorcet/Copeland results

2018-06-05_SF_Mayor-Board_of_Supervisors_District_8 Condorcet/Copeland results permalink:
🔗https://abif.electorama.com/id/2018-06-05_SF_Mayor-Board_of_Supervisors_District_8/pairwise#pairwise
  • Winner: RAFAEL MANDELMAN
  • Runner-up: JEFF SHEEHY (beats all other candidates except RAFAEL MANDELMAN)
  • Smallest margin: RAFAEL MANDELMAN over JEFF SHEEHY (20,242-12,913; margin: 7,329)
  • Largest margin: RAFAEL MANDELMAN over LAWRENCE ''STARK'' DAGESSE (27,196-2,219; margin: 24,977)
  • Pairwise ties: none
  • Total ballots: 36,067

Win-loss-tie (Condorcet/Copeland) table

2018-06-05_SF_Mayor-Board_of_Supervisors_District_8 w-l-t table permalink:
🔗https://abif.electorama.com/id/2018-06-05_SF_Mayor-Board_of_Supervisors_District_8/pairwise#wlt
Board of Supervisors District 8 (SF_Mayor; 2018-06-05) pairwise matchups
RAFAEL MANDELMAN
(2-0-0)
RAFAEL MANDELMAN
2 victories ⇣
JEFF SHEEHY
(1-1-0)
RAFAEL MANDELMAN: 20,242(56.1%)
JEFF SHEEHY: 12,913(35.8%)
(No preference: 2,912; 8.1%)
JEFF SHEEHY
⇽ 1 loss / 1 victory† ⇣
LAWRENCE ''STARK'' DAGESSE
(0-2-0)
RAFAEL MANDELMAN: 27,196(75.4%)
LAWRENCE ''STARK'' DAGESSE: 2,219(6.2%)
(No preference: 6,652; 18.4%)
JEFF SHEEHY: 23,528(65.2%)
LAWRENCE ''STARK'' DAGESSE: 2,801(7.8%)
(No preference: 9,738; 27.0%)

Pairwise tournament (Copeland ordered)

2018-06-05_SF_Mayor-Board_of_Supervisors_District_8 pairwise diagram permalink:
🔗https://abif.electorama.com/id/2018-06-05_SF_Mayor-Board_of_Supervisors_District_8/pairwise#dot

%3 RAFAEL MANDELMAN RAFAEL MANDELMAN 2-0-0 (2 wins, 0 losses, 0 ties) JEFF SHEEHY JEFF SHEEHY 1-1-0 RAFAEL MANDELMAN->JEFF SHEEHY ← RAFAEL MANDELMAN: 20242 JEFF SHEEHY: 12913 LAWRENCE ''STARK'' DAGESSE LAWRENCE ''STARK'' DAGESSE 0-2-0 RAFAEL MANDELMAN->LAWRENCE ''STARK'' DAGESSE ← RAFAEL MANDELMAN: 27196 LAWRENCE ''STARK'' DAGESSE: 2219 JEFF SHEEHY->LAWRENCE ''STARK'' DAGESSE ← JEFF SHEEHY: 23528 LAWRENCE ''STARK'' DAGESSE: 2801

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

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