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Evaluating an Instant Runoff Voting Election (IRV)

Public Posting of Raw Vote Data

Reviewing eligible, exhausted, under-votes, over-votes, and total ballots

San Francisco provides us the best example of accounting for IRV election results

We don't know what Fair Vote means by "valid ballots" and the San Francisco Department of Elections doesn't use this terminology. To evaluate an IRV election, San Francisco provides the raw vote data as below.  This allows interested citizens to measure the number of ballots cast compared to votes counted,  and whether people ranked additional choices beyond the first choice.

RCV District 4 Nov 2006

City and County of San Francisco
Consolidated General Election
November 7, 2006

RCV District 4

Go To:
Neighborhood Statistics |
RCV Assessor-Recorder | RCV Public Defender  |
RCV Dist 2 | RCV Dist 4 | RCV Dist 6 | RCV Dist 8 | RCV Dist 10 |

OFFICIAL RESULTS
RUN DATE: 12/05/06 11:43 AM

Race and Candidate Pass 1 Pass 2 Pass 3 Pass 4

Pre-RCV
Count

Pre-RCV Diff.

MEMBER, BOARD OF SUPERVISORS DIST. 4
RON DUDUM

5,134

5,521

6,305

7,587

5,072

62

ED JEW (Winner 52.507%)

5,184

5,441

6,455

8,388

5,125

59

JAYNRY MAK

4,569

5,012

5,851*

4,504

65

DOUG CHAN

3,236

3,414*

3,192

44

HOUSTON ZHENG

234*

225

9

DAVID FERGUSON

1,455*

1,419

36

WRITE-IN

2*

2

0

Eligible Ballots

19,814

19,388

18,611

15,975

Undervotes

2,253

Exhausted Ballots

2,171

2,597

3,374

6,010

Overvotes

193

Total Ballots

21,985

21,985

21,985

21,985

Total

21,985

To understand the difference between the Pre-RCV and RCV vote totals:
  1. A number of undervotes reported were, in fact, advanceable ballots (Difference column)
  2. The RCV algorithm advances those ballots and sums them in Pass1.
  3. The candidate(s) with the lowest vote total is selected for elimination (indicated with an asterisk * )
Ballot Definitions:
  • The number of Eligible Ballots (for Pass 1) is the number of ballots with a mark for a candidate in the 1st choice, plus those whose marks were advanced.
  • The number of Exhausted Ballots is the number of undervotes minus the number of advanced ballots, plus the number of overvotes (invalid votes for multiple candidates).
  • The number of Total Ballots is all cards, marked in any way, or blank.

For more information, please go to www.sfgov.org/election/rcv

Observations of raw vote data for District 4 : 

  • There were 2,253 undervotes, for 10.25% of the 21,985 ballots cast.
  • There were 193 overvotes, for .87% of the 21,985 ballots cast,
  • In just the first pass alone, 2,171 ballots were exhausted, or 9.87% of all ballots cast.
  • By the fourth pass, the number of exhausted ballots was 6,010, or 27.34% of all ballots cast.

RCV District 6

Go To:
Neighborhood Statistics |
RCV Assessor-Recorder | RCV Public Defender  |
RCV Dist 2 | RCV Dist 4 | RCV Dist 6 | RCV Dist 8 | RCV Dist 10 |

OFFICIAL RESULTS
RUN DATE: 12/05/06 11:50 AM

Race and Candidate Pass 1 Pass 2 Pass 3 Pass 4 Pass 5

Pre-RCV
Count

Pre-RCV Diff.

MEMBER, BOARD OF SUPERVISORS DIST. 6
VILIAM DUGOVIC

340

348

358*

330

10

GEORGE DIAS

230

231*

222

8

MATT DRAKE

679

688

725

830

869

669

10

CHRIS DALY (Winner 50.822%)

8,746

8,763

8,803

8,871

8,968

8,654

92

DAVY JONES

389

402

421

463

506

372

17

ROBERT JORDAN

125*

119

6

MANUEL JIMENEZ, JR.

317

328

375

399*

311

6

ROB BLACK

7,115

7,134

7,173

7,215

7,303

7,051

64

WRITE-IN

*

0

0

Eligible Ballots

17,941

17,894

17,855

17,778

17,646

Undervotes

2,027

Exhausted Ballots

1,974

2,021

2,060

2,137

2,269

Overvotes

160

Total Ballots

19,915

19,915

19,915

19,915

19,915

Total

19,915

We don't know what Fair Vote means when they refer to "valid ballots" in their talking points, so we can only discuss how IRV (RCV) affects the number of ballots/votes cast and counted.

For more information, please go to www.sfgov.org/election/rcv

 

 

 

 

.

 

Observations of raw vote data of RCV for District 6:   

There were 2,027 undervotes (no votes cast on the ballot choice) for 10.17% of the 19,915 ballots cast

There were 160 overvotes for .80% of the 19,915 ballots cast.

In the first pass, 1.974 or 9.91% of ballots were exhausted, meaning the voters did not rank a 2nd or 3rd choice.

By the fourth pass, the number of exhausted ballots was 2.269 or 11.39% of all ballots cast.

 

For more information, please go to www.sfgov.org/election/rcv