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NYC 2025 Primary DEM Council Member District 10

🔗 nyc2025-primary-dem-council-member-d10     (tags: { nyc , 2025 , actual , NY , NYC-2025 , NYC_NY , primary_election , RCV })

Below is the ABIF from the "nyc2025-primary-dem-council-member-d10" election (NYC 2025 Primary DEM Council Member District 10)

ABIF submission area (show)
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Voting methods: IRV • FPTP • approval • STAR • Pairwise • All methods

Results

🔗https://abif.electorama.com/id/nyc2025-primary-dem-council-member-d10

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 Carmen N. De La Rosa
FPTP Carmen N. De La Rosa
Approval Carmen N. De La Rosa
STAR Carmen N. De La Rosa
Condorcet/Copeland Carmen N. De La Rosa
Election results summary showing voting method winners
click/tap to expand
tabbed view

IRV/RCV results

nyc2025-primary-dem-council-member-d10 IRV/RCV result permalink:
🔗https://abif.electorama.com/id/nyc2025-primary-dem-council-member-d10/IRV#IRV

  • IRV/RCV Winner: Carmen N. De La Rosa with 20,423 votes (87.0%) in final round
  • Runner-up: Francesca Castellanos with 2,924 votes (12.5%) in final round
  • Exhausted ballots in final round: 0 (0.0%)
  • Number of rounds: 1
  • Ballots counted in final round: 23,475 (100.0%)
  • Majority of ballots: 11,738 (50.0%)
  • Total ballots: 23,475
Round 1
Overview:
Active ballots: 23,475 (100.0%)

Exhausted ballots: 0 (0.0%)
Counted ballots: 23,475 (100.0%)
IRV/RCV winner:
Carmen N. De La Rosa: 20,423 (87.0%)✅
→
Francesca Castellanos: 2,924 (12.5%) (🛑eliminated)
→
Candidate Write-in: 128 (0.5%) (🛑eliminated)
→

FPTP result

"FPTP" is "First-past-the-post", also known as "plurality" or "choose-one"
nyc2025-primary-dem-council-member-d10 FPTP results permalink:
🔗https://abif.electorama.com/id/nyc2025-primary-dem-council-member-d10/FPTP#FPTP
📝
Note — Only using first-choices on ranked ballots

  • FPTP Winner: Carmen N. De La Rosa with 20,423 first-place votes (87.0%)
  • Runner-up: Francesca Castellanos with 2,924 first-place votes (12.5%)
  • Margin of victory: 17,499 votes (74.5 percentage points)
  • First-place votes
    • Carmen N. De La Rosa: 20,423 votes (87.0 %)
    • Francesca Castellanos: 2,924 votes (12.5 %)
    • Candidate Write-in: 128 votes (0.5 %)
  • Total ballots: 23,475

Approval voting results

nyc2025-primary-dem-council-member-d10 approval voting results permalink:
🔗https://abif.electorama.com/id/nyc2025-primary-dem-council-member-d10/approval#approval
📝
Note — Approval counts estimated from 23,475 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: Carmen N. De La Rosa and Francesca Castellanos. 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: 23475}
{ballotcount_abif_metadata: "325335"}
{title: "NYC 2025 Democratic Primary - DEM Council Member District 10 (District 10)"}
{description: "Ranked-choice voting data for NYC 2025 Democratic Primary DEM Council Member District 10"}
{emptyballotcount: "301860"}
{is_ranking_to_rating: true}
#------ candlines ------
=CNDL257415:[Carmen N. De La Rosa]
=FC259234:[Francesca Castellanos]
=CANDWrite-in:[Candidate Write-in]
#------- votelines ------
13292:CNDL257415/1
6699:CNDL257415/1
1501:FC259234/1
1322:FC259234/1
187:CNDL257415/1
115:CNDL257415/1
49:CNDL257415/1
29:CNDL257415/1
22:CNDL257415/1
22:FC259234/1
21:FC259234/1
21:FC259234/1
19:FC259234/1
19:CNDL257415/1
11:CANDWrite-in/1=CNDL257415/1
10:FC259234/1
9:CANDWrite-in/1=CNDL257415/1
9:CNDL257415/1
8:CANDWrite-in/1=FC259234/1
8:CANDWrite-in/1=FC259234/1
5:FC259234/1
2:FC259234/1
1:CNDL257415/1
1:CNDL257415/1
1:FC259234/1
  • Approval Winner: Carmen N. De La Rosa
  • Approval Results:
    • Carmen N. De La Rosa (CNDL257415) — 20,443 approvals (87.08% of ballots) (✅ winner)
    • Francesca Castellanos (FC259234) — 2,940 approvals (12.52% of ballots)
    • Candidate Write-in (CANDWrite-in) — 36 approvals (0.15% of ballots)
  • Total: 23,475 ballots (23,419 total approvals)

STAR results

nyc2025-primary-dem-council-member-d10 STAR results permalink:
🔗https://abif.electorama.com/id/nyc2025-primary-dem-council-member-d10/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: Carmen N. De La Rosa
  • Finalists: Carmen N. De La Rosa vs Francesca Castellanos
  • Runoff result:
    • Carmen N. De La Rosa: 20,443 votes (87.1%)
    • Francesca Castellanos: 2,940 votes (12.5%)
    • No preference: 92 voters (0.4%)
  • Total stars allocated: 55,300
  • Total ballots: 23,475
★★★★★★

★★★★★

★★★★★★
★★★★★
★★★★★★
★★★★★
★★★★★★
★★★★★
★★★★★★
(one star above is approximately 1,106 stars allocated by voters)
  • First round:
    • ★#0: Carmen N. De La Rosa received 42,233 stars (76.4%) from 21,810 voters (92.9%)
    • ★#1: Francesca Castellanos received 12,706 stars (23.0%) from 9,782 voters (41.7%)
    • ★#2: Candidate Write-in received 361 stars (0.7%) from 233 voters (1.0%)
  • Finalists:
    • ★Carmen N. De La Rosa (✅ winner) preferred by 20,443 of 23,475 voters
    • ★Francesca Castellanos preferred by 2,940 of 23,475 voters
    • ★No preference between the finalists: 92

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

Condorcet/Copeland results

nyc2025-primary-dem-council-member-d10 Condorcet/Copeland results permalink:
🔗https://abif.electorama.com/id/nyc2025-primary-dem-council-member-d10/pairwise#pairwise
  • Winner: Carmen N. De La Rosa
  • Runner-up: Francesca Castellanos (beats all other candidates except Carmen N. De La Rosa)
  • Smallest margin: Francesca Castellanos over Candidate Write-in (9,766-201; margin: 9,565)
  • Largest margin: Carmen N. De La Rosa over Candidate Write-in (21,790-160; margin: 21,630)
  • Pairwise ties: none
  • Total ballots: 23,475

Win-loss-tie (Condorcet/Copeland) table

nyc2025-primary-dem-council-member-d10 w-l-t table permalink:
🔗https://abif.electorama.com/id/nyc2025-primary-dem-council-member-d10/pairwise#wlt
NYC 2025 Primary DEM Council Member District 10 pairwise matchups
Carmen N. De La Rosa
(2-0-0)
Carmen N. De La Rosa
2 victories ⇣
Francesca Castellanos
(1-1-0)
Carmen N. De La Rosa: 20,443(87.1%)
Francesca Castellanos: 2,940(12.5%)
(No preference: 92; 0.4%)
Francesca Castellanos
⇽ 1 loss / 1 victory† ⇣
Candidate Write-in
(0-2-0)
Carmen N. De La Rosa: 21,790(92.8%)
Candidate Write-in: 160(0.7%)
(No preference: 1,525; 6.5%)
Francesca Castellanos: 9,766(41.6%)
Candidate Write-in: 201(0.9%)
(No preference: 13,508; 57.5%)

Pairwise tournament (Copeland ordered)

nyc2025-primary-dem-council-member-d10 pairwise diagram permalink:
🔗https://abif.electorama.com/id/nyc2025-primary-dem-council-member-d10/pairwise#dot

%3 CNDL257415 CNDL257415 2-0-0 (2 wins, 0 losses, 0 ties) FC259234 FC259234 1-1-0 CNDL257415->FC259234 ← CNDL257415: 20443 FC259234: 2940 CANDWrite-in CANDWrite-in 0-2-0 CNDL257415->CANDWrite-in ← CNDL257415: 21790 CANDWrite-in: 160 FC259234->CANDWrite-in ← FC259234: 9766 CANDWrite-in: 201

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

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