File:Election Audit Sizes.png
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Summary
| Description |
English: Risk-limiting election audits: Sample sizes depend on method, winning margin, number of ballots voted, and confidence level. |
| Date | |
| Source | Own work |
| Author | Numbersinstitute |
For example in an election where 40,000 ballots were voted, Ballot Comparison means one compares manual and computer interpretations, ballot by ballot, for about:
- 3,000 ballots if candidate won by 0.2% (50.1% to 49.9%)
- 300 ballots if candidate won by 2% (51% to 49%)
- 80 ballots if candidate won by 8% (54% to 46%)
Ballot Poll is less feasible for close margins, because it means one compares official results to the total of a sample of ballots (like opinion polling):
- all ballots if candidate won by 0.2%
- 10,000 ballots if candidate won by 2%
- 720 ballots if candidate won by 8%
If sample suggests initial winner is wrong, these approaches require hand-counting all ballots. Other approaches are described in the article on Election audits
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:45, 15 August 2019 | | 657 × 1,030 (251 KB) | Numbersinstitute | changed color of 0.1% lines to match on both sides of graph |
| 23:40, 29 May 2018 |  | 649 × 895 (75 KB) | Numbersinstitute | Showed full hand-count if machines are wrong | |
| 18:10, 25 April 2018 |  | 623 × 896 (68 KB) | Numbersinstitute | More range of victory margins, and resulting sample sizes | |
| 00:56, 18 April 2018 |  | 810 × 1,433 (101 KB) | Numbersinstitute | User created page with UploadWizard |
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