"Favorite Betrayal" probability in IRV (alternative probabilistic model)

As requested I have redone the calculation that was here but now assuming S,T,U,V,W,X,Y,Z are no longer normally distributed but rather are the lengths of the intervals separating sorted random uniform variables in [0,1]. This also is known as the Dirichlet model.

Under this new probabilistic model:
Instead of 19.6%, my Monte Carlo program finds as the probability P of a favorite betrayal scenario in a 3-canddt IRV election: P = 20.2%.

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