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Correct description of backwards tie breaking algorithm

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RunasSudo 2021-08-02 20:14:03 +10:00
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docs/options.md
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@ -25,7 +25,7 @@ The preset dropdown allows you to choose from a hardcoded list of preloaded STV
Exceptions: Exceptions:
* [E1] When generating random numbers, OpenTally uses a [deterministic random number generator based on SHA-256](rng.md), rather than the Wichmann–Hill(-based) algorithm. * [E1] When generating random numbers, OpenTally uses a [deterministic random number generator based on SHA-256](rng.md), rather than the Wichmann–Hill(-based) algorithm.
* [E2] When breaking ties forwards/backwards, OpenTally selects the candidate who had more/fewer votes at the first/last stage when *any* tied candidate had more/fewer votes than the others, rather than the method described in the legislation (when each all had unequal votes). The OpenTally developers regard the method described in the legislation as a defect. For an independent discussion, see <a href="https://dl.acm.org/doi/10.1145/3014812.3014837">Conway et al.</a> * [E2] When breaking ties backwards, OpenTally selects the candidate who had more/fewer votes at the last stage when *any* tied candidate had more/fewer votes, rather than the method described in the legislation (when each all had unequal votes). The OpenTally developers regard the method described in the legislation as a defect. For an independent discussion, see <a href="https://dl.acm.org/doi/10.1145/3014812.3014837">Conway et al.</a>
* [E3] A tie between 2 candidates for the final vacancy will be broken backwards then at random, rather than the method described in the legislation. * [E3] A tie between 2 candidates for the final vacancy will be broken backwards then at random, rather than the method described in the legislation.
* [E4] The quota is always calculated to 2 decimal places. For full ERS76 (ERS73) compliance, set *Round quota to 0 d.p.* when the quota is more than 100 (100 or more). * [E4] The quota is always calculated to 2 decimal places. For full ERS76 (ERS73) compliance, set *Round quota to 0 d.p.* when the quota is more than 100 (100 or more).
@ -114,7 +114,7 @@ When *Surplus method* is set to *Meek method*, this option controls how candidat
This dropdown allows you to select how ties (in surplus transfer or exclusion) are broken. The options are: This dropdown allows you to select how ties (in surplus transfer or exclusion) are broken. The options are:
* *Backwards*: Ties are broken according to which tied candidate had the most/fewest votes at the end of the *most recent* stage where one tied candidate had more/fewer votes than the others, if such a stage exists. * *Backwards*: Ties are broken according to which tied candidate had the most/fewest votes at the end of the *previous* stage. If a tie for most/fewest votes exists in the previous stage also, that tie is broken based on the next previous stage, and so on. This is the method specified, for example, by the [*Electoral Act 1992* (ACT)](https://www.legislation.act.gov.au/View/a/1992-71/current/PDF/1992-71.PDF).
* *Fowards*: Ties are broken according to which tied candidate had the most/fewest votes at the end of the *earliest* stage where one tied candidate had more/fewer votes than the others, if such a stage exists. This is also known as the ‘ahead at first difference’ method. * *Fowards*: Ties are broken according to which tied candidate had the most/fewest votes at the end of the *earliest* stage where one tied candidate had more/fewer votes than the others, if such a stage exists. This is also known as the ‘ahead at first difference’ method.
* *Random*: Ties are broken at random (see *Random seed*). * *Random*: Ties are broken at random (see *Random seed*).
* *Prompt*: The user is prompted to break the tie. * *Prompt*: The user is prompted to break the tie.