Accumulation Charts for Instant-Runoff Voting
For displaying the results of Instant-runoff voting (IRV)
for single-winner elections and single-transferrable voting
(STV) for multi-winner elections.
See
our preprint or
our paper in the Notices of the
AMS. By Bridget
Tenner and Greg
Warrington. Information on how to read the
charts.
| Historical election to show |
|
|
|---|---|---|
| Ballot coloring method | Descriptions below chart | |
| Show exhausted votes | Not available in all data sets | |
| Round order |
Chart is zoomable; hover for information on ballots
Note: The data we use to create these charts may differ
slightly from the final, certified data. Also, there are
different, reasonable choices as to how to deal with the
various imperfect types of ranked ballots. As this page exists
primarily to illustrate Accumulation Charts, and due to
limited resources, we have not made a determined effort to
track down the specific rules used for each
election. github
repository for code.
Options for how ballots are colored:
Options for how ballots are colored:
- Color ballots by ranking: This is the default option and what is described in all of the material on the accompanying Information page.
- Color ballots by first choice: With this color scheme, each ballot is permanently colored according to the first-choice preference on it.
- Color ballots only by candidate: With this color scheme, the height of the bar for any given ballot indicates how low of a preference that candidate was. This is similar to the default color scheme, except that the colors for already-eliminated candidates are surpressed. A full-height bar indicates first choice, half-height indicates second choice, third-height indicates third choice, etc.
- Color ballots by segment: This is similar to coloring by candidate, except the information about ranking is surpressed, so it is easy to tell how many votes a candidate accumulated in a given round.