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RankChoiceVoting.jl

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This package provides a framework for simulating and evaluating rank choice voting systems. See the documentation for details.

Quick Example

The code block below provides an example in which the instant runoff voting system violates the monotonicity criterion. First, load the package and generate some rank choice votes.

using RankChoiceVoting 
ranks = [[:a,:b,:c],[:b,:c,:a],[:b,:a,:c],[:c,:a,:b]]
counts = [37,22,12,29] 
rankings = Ranks(counts, ranks)
counts      ranks
37          [:a, :b, :c]
22          [:b, :c, :a]
12          [:b, :a, :c]
29          [:c, :a, :b]

Next, create an object for an instant runoff system and the monotonicity criterion.

system = InstantRunOff()
criterion = Monotonicity()

Now we can use the function satisfies to determine whether the instant runoff system violates monotonicty in the provided rank choice votes.

satisfies(system, criterion, rankings)
false

See the documentation for more information and examples.

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Update IIA

Currently IIA only examines whether removing a subset of losers changes the winner. A more strict criterion would check whether the relative ranking changes if any subset of candidates are removed. It might be worth distinguishing between cases that affect the ranking vs. cases that only affect the winner.

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