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Board of Supervisors District 2 (SanFrancisco; 2018-11-06)

🔗 2018-11-06_SanFrancisco-Board_of_Supervisors_District_2     (tags: { from-bolson , actual , 2018 , 2018-11 , SF , SanFrancisco_CA , SanFrancisco-2018 , CA })

Below is the ABIF from the "2018-11-06_SanFrancisco-Board_of_Supervisors_District_2" election (Board of Supervisors District 2 (SanFrancisco; 2018-11-06))

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

Results

🔗https://abif.electorama.com/id/2018-11-06_SanFrancisco-Board_of_Supervisors_District_2

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

IRV/RCV results

2018-11-06_SanFrancisco-Board_of_Supervisors_District_2 IRV/RCV result permalink:
🔗https://abif.electorama.com/id/2018-11-06_SanFrancisco-Board_of_Supervisors_District_2/IRV#IRV

  • IRV/RCV Winner: CATHERINE STEFANI with 17,344 votes (43.5%) in final round
  • Runner-up: NICK JOSEFOWITZ with 16,105 votes (40.4%) in final round
  • Exhausted ballots in final round: 6,457 (16.2%)
  • Number of rounds: 3
  • Ballots counted in final round: 33,449 (83.8%)
  • Majority of ballots: 19,954 (50.0%)
  • Total ballots: 39,906
Round 1 Round 2 Round 3
Overview:
Active ballots: 39,906 (100.0%)

Exhausted ballots: 4,546 (11.4%)
Counted ballots: 35,360 (88.6%)
Winning threshold: 17,681 (44.31%)
 		Overview:
Active ballots: 39,906 (100.0%)

Exhausted ballots: 5,566 (13.9%)
Counted ballots: 34,340 (86.1%)
Winning threshold: 17,171 (43.03%)
 		Overview:
Active ballots: 39,906 (100.0%)

Exhausted ballots: 6,457 (16.2%)
Counted ballots: 33,449 (83.8%)
Winning threshold: 16,725 (41.91%)
CATHERINE STEFANI: 14,368 (36.0%)
→
 CATHERINE STEFANI: 14,973 (37.5%)
→
 IRV/RCV winner:
CATHERINE STEFANI: 17,344 (43.5%)✅
→
NICK JOSEFOWITZ: 13,683 (34.3%)
→
 NICK JOSEFOWITZ: 14,373 (36.0%)
→
 NICK JOSEFOWITZ: 16,105 (40.4%) (🛑eliminated)
→
SCHUYLER HUDAK: 4,206 (10.5%)
→
 SCHUYLER HUDAK: 4,994 (12.5%) (🛑eliminated)
→
 SCHUYLER HUDAK
JOHN DENNIS: 3,103 (7.8%) (🛑eliminated)
→
 JOHN DENNIS JOHN DENNIS

FPTP result

"FPTP" is "First-past-the-post", also known as "plurality" or "choose-one"
2018-11-06_SanFrancisco-Board_of_Supervisors_District_2 FPTP results permalink:
🔗https://abif.electorama.com/id/2018-11-06_SanFrancisco-Board_of_Supervisors_District_2/FPTP#FPTP
📝
Note — Only using first-choices on ranked ballots

  • FPTP Winner: CATHERINE STEFANI with 14,368 first-place votes (36.0%)
  • Runner-up: NICK JOSEFOWITZ with 13,683 first-place votes (34.3%)
  • Margin of victory: 685 votes (1.7 percentage points)
  • First-place votes
    • CATHERINE STEFANI: 14,368 votes (36.0 %)
    • NICK JOSEFOWITZ: 13,683 votes (34.3 %)
    • SCHUYLER HUDAK: 4,206 votes (10.5 %)
    • JOHN DENNIS: 3,103 votes (7.8 %)
  • Blanks: 4,546 (11.4 %)
  • Total ballots: 39,906

Approval voting results

2018-11-06_SanFrancisco-Board_of_Supervisors_District_2 approval voting results permalink:
🔗https://abif.electorama.com/id/2018-11-06_SanFrancisco-Board_of_Supervisors_District_2/approval#approval
📝
Note — Approval counts estimated from 39,906 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 3 candidates appear viable: CATHERINE STEFANI, NICK JOSEFOWITZ, and SCHUYLER HUDAK. The approximation then assumes each voter approves up to 2 of their top-ranked viable candidates (half of 3, rounded up). All candidates ranked at or above the lowest-ranked of each ballot's top viable candidates receive approval (considering up to 2 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: 39906}
{version: "0.1"}
{ballotcount_abif_metadata: "39906"}
{is_ranking_to_rating: true}
#------ candlines ------
=[CATHERINE STEFANI]:[CATHERINE STEFANI]
=[NICK JOSEFOWITZ]:[NICK JOSEFOWITZ]
=[SCHUYLER HUDAK]:[SCHUYLER HUDAK]
=[JOHN DENNIS]:[JOHN DENNIS]
#------- votelines ------
3274:[CATHERINE STEFANI]/1
2927:[CATHERINE STEFANI]/1=[NICK JOSEFOWITZ]/1
2653:[NICK JOSEFOWITZ]/1
2198:[CATHERINE STEFANI]/1=[NICK JOSEFOWITZ]/1
1959:[NICK JOSEFOWITZ]/1=[SCHUYLER HUDAK]/1
1900:[CATHERINE STEFANI]/1=[SCHUYLER HUDAK]/1
1867:[CATHERINE STEFANI]/1=[NICK JOSEFOWITZ]/1
1493:[CATHERINE STEFANI]/1=[NICK JOSEFOWITZ]/1
1193:[CATHERINE STEFANI]/1
1118:[CATHERINE STEFANI]/1=[SCHUYLER HUDAK]/1
990:[CATHERINE STEFANI]/1=[SCHUYLER HUDAK]/1
907:[CATHERINE STEFANI]/1=[SCHUYLER HUDAK]/1
775:[NICK JOSEFOWITZ]/1=[SCHUYLER HUDAK]/1
747:[NICK JOSEFOWITZ]/1=[SCHUYLER HUDAK]/1
721:[CATHERINE STEFANI]/1=[NICK JOSEFOWITZ]/1
719:[NICK JOSEFOWITZ]/1
623:[CATHERINE STEFANI]/1=[NICK JOSEFOWITZ]/1
619:[JOHN DENNIS]/1=[NICK JOSEFOWITZ]/1=[SCHUYLER HUDAK]/1
589:[CATHERINE STEFANI]/1=[JOHN DENNIS]/1=[SCHUYLER HUDAK]/1
475:[NICK JOSEFOWITZ]/1=[SCHUYLER HUDAK]/1
410:[CATHERINE STEFANI]/1=[SCHUYLER HUDAK]/1
406:[CATHERINE STEFANI]/1=[JOHN DENNIS]/1=[NICK JOSEFOWITZ]/1
392:[SCHUYLER HUDAK]/1
375:[CATHERINE STEFANI]/1=[SCHUYLER HUDAK]/1
339:[CATHERINE STEFANI]/1=[JOHN DENNIS]/1=[SCHUYLER HUDAK]/1
306:[CATHERINE STEFANI]/1=[JOHN DENNIS]/1=[NICK JOSEFOWITZ]/1
268:[JOHN DENNIS]/1=[NICK JOSEFOWITZ]/1=[SCHUYLER HUDAK]/1
263:[JOHN DENNIS]/1=[NICK JOSEFOWITZ]/1=[SCHUYLER HUDAK]/1
247:[CATHERINE STEFANI]/1=[JOHN DENNIS]/1=[SCHUYLER HUDAK]/1
243:[CATHERINE STEFANI]/1=[JOHN DENNIS]/1=[NICK JOSEFOWITZ]/1
243:[JOHN DENNIS]/1=[NICK JOSEFOWITZ]/1=[SCHUYLER HUDAK]/1
242:[NICK JOSEFOWITZ]/1=[SCHUYLER HUDAK]/1
237:[CATHERINE STEFANI]/1=[JOHN DENNIS]/1=[SCHUYLER HUDAK]/1
197:[CATHERINE STEFANI]/1
185:[NICK JOSEFOWITZ]/1=[SCHUYLER HUDAK]/1
178:[CATHERINE STEFANI]/1=[NICK JOSEFOWITZ]/1
174:[SCHUYLER HUDAK]/1
168:[CATHERINE STEFANI]/1=[JOHN DENNIS]/1=[NICK JOSEFOWITZ]/1
162:[JOHN DENNIS]/1=[SCHUYLER HUDAK]/1
155:[CATHERINE STEFANI]/1=[NICK JOSEFOWITZ]/1
152:[NICK JOSEFOWITZ]/1
148:[CATHERINE STEFANI]/1=[JOHN DENNIS]/1
146:[JOHN DENNIS]/1=[NICK JOSEFOWITZ]/1
104:[CATHERINE STEFANI]/1=[SCHUYLER HUDAK]/1
88:[SCHUYLER HUDAK]/1
81:[CATHERINE STEFANI]/1
75:[CATHERINE STEFANI]/1=[NICK JOSEFOWITZ]/1
69:[CATHERINE STEFANI]/1=[SCHUYLER HUDAK]/1
54:[CATHERINE STEFANI]/1=[NICK JOSEFOWITZ]/1
54:[NICK JOSEFOWITZ]/1
40:[NICK JOSEFOWITZ]/1=[SCHUYLER HUDAK]/1
40:[NICK JOSEFOWITZ]/1=[SCHUYLER HUDAK]/1
39:[CATHERINE STEFANI]/1=[SCHUYLER HUDAK]/1
32:[CATHERINE STEFANI]/1=[JOHN DENNIS]/1
28:[CATHERINE STEFANI]/1
28:[NICK JOSEFOWITZ]/1
26:[CATHERINE STEFANI]/1
25:[NICK JOSEFOWITZ]/1=[SCHUYLER HUDAK]/1
24:[CATHERINE STEFANI]/1=[SCHUYLER HUDAK]/1
23:[SCHUYLER HUDAK]/1
21:[JOHN DENNIS]/1=[NICK JOSEFOWITZ]/1
20:[CATHERINE STEFANI]/1=[JOHN DENNIS]/1
20:[SCHUYLER HUDAK]/1
17:[JOHN DENNIS]/1=[SCHUYLER HUDAK]/1
12:[JOHN DENNIS]/1=[NICK JOSEFOWITZ]/1
12:[NICK JOSEFOWITZ]/1=[SCHUYLER HUDAK]/1
10:[NICK JOSEFOWITZ]/1
8:[SCHUYLER HUDAK]/1
7:[JOHN DENNIS]/1=[SCHUYLER HUDAK]/1
  • Approval Winner: CATHERINE STEFANI
  • Approval Results:
    • CATHERINE STEFANI — 23,761 approvals (59.54% of ballots) (✅ winner)
    • NICK JOSEFOWITZ — 21,102 approvals (52.88% of ballots)
    • SCHUYLER HUDAK — 14,132 approvals (35.41% of ballots)
    • JOHN DENNIS — 4,493 approvals (11.26% of ballots)
  • Total: 39,906 ballots (63,488 total approvals)

STAR results

2018-11-06_SanFrancisco-Board_of_Supervisors_District_2 STAR results permalink:
🔗https://abif.electorama.com/id/2018-11-06_SanFrancisco-Board_of_Supervisors_District_2/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 4 candidates, so the 1st choice gets 3 points, the 2nd choice gets 2 points, etc. These Borda scores are then used as STAR ratings for tabulation by STAR.

  • STAR winner: CATHERINE STEFANI
  • Finalists: CATHERINE STEFANI vs NICK JOSEFOWITZ
  • Runoff result:
    • CATHERINE STEFANI: 17,344 votes (43.5%)
    • NICK JOSEFOWITZ: 16,105 votes (40.4%)
    • No preference: 6457 voters (16.2%)
  • Total stars allocated: 176,060
  • Total ballots: 39,906
★★★★★★

★★★★★

★★★★★★
★★★★★
★★★★★★
★★★★★
★★★★★★
★★★★★
★★★★★★
(one star above is approximately 3,521 stars allocated by voters)
  • First round:
    • ★#0: CATHERINE STEFANI received 63,361 stars (36.0%) from 26,467 voters (66.3%)
    • ★#1: NICK JOSEFOWITZ received 57,714 stars (32.8%) from 23,909 voters (59.9%)
    • ★#2: SCHUYLER HUDAK received 35,882 stars (20.4%) from 19,257 voters (48.3%)
    • ★#3: JOHN DENNIS received 19,103 stars (10.9%) from 9,927 voters (24.9%)
  • Finalists:
    • ★CATHERINE STEFANI (✅ winner) preferred by 17,344 of 39,906 voters
    • ★NICK JOSEFOWITZ preferred by 16,105 of 39,906 voters
    • ★No preference between the finalists: 6457

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

Condorcet/Copeland results

2018-11-06_SanFrancisco-Board_of_Supervisors_District_2 Condorcet/Copeland results permalink:
🔗https://abif.electorama.com/id/2018-11-06_SanFrancisco-Board_of_Supervisors_District_2/pairwise#pairwise
  • Winner: CATHERINE STEFANI
  • Runner-up: NICK JOSEFOWITZ (beats all other candidates except CATHERINE STEFANI)
  • Smallest margin: SCHUYLER HUDAK over JOHN DENNIS (16,756-6,808; margin: 9,948)
  • Largest margin: CATHERINE STEFANI over JOHN DENNIS (24,627-5,944; margin: 18,683)
  • Pairwise ties: none
  • Total ballots: 39,906

Win-loss-tie (Condorcet/Copeland) table

2018-11-06_SanFrancisco-Board_of_Supervisors_District_2 w-l-t table permalink:
🔗https://abif.electorama.com/id/2018-11-06_SanFrancisco-Board_of_Supervisors_District_2/pairwise#wlt
Board of Supervisors District 2 (SanFrancisco; 2018-11-06) pairwise matchups
CATHERINE STEFANI
(3-0-0)
CATHERINE STEFANI
3 victories ⇣
NICK JOSEFOWITZ
(2-1-0)
CATHERINE STEFANI: 17,344(43.5%)
NICK JOSEFOWITZ: 16,105(40.4%)
(No preference: 6,457; 16.2%)
NICK JOSEFOWITZ
⇽ 1 loss / 2 victories† ⇣
SCHUYLER HUDAK
(1-2-0)
CATHERINE STEFANI: 21,390(53.6%)
SCHUYLER HUDAK: 9,155(22.9%)
(No preference: 9,361; 23.5%)
NICK JOSEFOWITZ: 19,370(48.5%)
SCHUYLER HUDAK: 9,971(25.0%)
(No preference: 10,565; 26.5%)
SCHUYLER HUDAK
⇽ 2 losses / 1 victory† ⇣
JOHN DENNIS
(0-3-0)
CATHERINE STEFANI: 24,627(61.7%)
JOHN DENNIS: 5,944(14.9%)
(No preference: 9,335; 23.4%)
NICK JOSEFOWITZ: 22,239(55.7%)
JOHN DENNIS: 6,351(15.9%)
(No preference: 11,316; 28.4%)
SCHUYLER HUDAK: 16,756(42.0%)
JOHN DENNIS: 6,808(17.1%)
(No preference: 16,342; 41.0%)

Pairwise tournament (Copeland ordered)

2018-11-06_SanFrancisco-Board_of_Supervisors_District_2 pairwise diagram permalink:
🔗https://abif.electorama.com/id/2018-11-06_SanFrancisco-Board_of_Supervisors_District_2/pairwise#dot

%3 CATHERINE STEFANI CATHERINE STEFANI 3-0-0 (3 wins, 0 losses, 0 ties) NICK JOSEFOWITZ NICK JOSEFOWITZ 2-1-0 CATHERINE STEFANI->NICK JOSEFOWITZ ← CATHERINE STEFANI: 17344 NICK JOSEFOWITZ: 16105 SCHUYLER HUDAK SCHUYLER HUDAK 1-2-0 CATHERINE STEFANI->SCHUYLER HUDAK ← CATHERINE STEFANI: 21390 SCHUYLER HUDAK: 9155 JOHN DENNIS JOHN DENNIS 0-3-0 CATHERINE STEFANI->JOHN DENNIS ← CATHERINE STEFANI: 24627 JOHN DENNIS: 5944 NICK JOSEFOWITZ->SCHUYLER HUDAK ← NICK JOSEFOWITZ: 19370 SCHUYLER HUDAK: 9971 NICK JOSEFOWITZ->JOHN DENNIS ← NICK JOSEFOWITZ: 22239 JOHN DENNIS: 6351 SCHUYLER HUDAK->JOHN DENNIS ← SCHUYLER HUDAK: 16756 JOHN DENNIS: 6808

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

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