On 07/10/2022 10:05, Richard Lung wrote: > > > Non-monotonic, unmonotonic and monotonic STV. > > A decided judgment on the single transferable vote is that it is > non-monotonic. Strictly speaking, tho, this is an incorrect use of > language. Because STV surplus transfers are monotonic. Non-monotonic > is an untoward effect, in the potentially different elimination of > least prefered candidates. But altogether, STV is not non-monotonic; > it is partly monotonic. STV might better be called unmonotonic. It is > only residualy non-monotonic. > > I claimed that Binomial STV is completely monotonic, on the grounds > that it complements the monotonic surplus transfers election count, > with a like exclusion count, with the preferences reversed. (Binomial > STV does not eliminate [or elect] candidates during its count procedure.) > > Kristofer challenged my right to claim monotonicity, saying he didn’t > know any system of STV that wasn’t non-monotonic. My thanks to > Kristofer for his test on Binomial STV. He admitted it is monotonic, > giving as a reason, that it counts abstentions. > > Regards, > > Richard Lung. >