[EM] Strategy-proof vs Monotone

[Forest Simmons]

Richard,

For the requested trial he needs pseudo code for Binomial STV!

El mié., 19 de ene. de 2022 1:16 p. m., Richard Lung <
voting at ukscientists.com> escribió:

>
> km,
> You are repeating what the rest of my post already says -- the need for
> testing in realistic scenarios. -- Not so much to test monotonicity and
> strategy resistance. That is guaranteed by the removal of the ad hoc
> premature exclusion of candidates. And replacing it with an exclusion
> count, symmetrical to, or exactly the same as the election count,  That is
> a transferable vote, known to be monotonic -- and hence so, in an exclusion
> count as well as an election count.
> I have actually given the odd example for illustrative purposes, which
> shows that when you swap preference transfers, it can never create a
> strategy incentive. That is because preference changes are always
> accompanied by a change in the respective candidates keep values. There is
> proper book-keeping of the electoral accounts!
>
> You should be prepared to be surprised. Being surprised is no argument.
>
> You raised a much more pertinent criticism of binomial stv, which needs to
> be tested by trial elections, to which I wrote an answer, not to hand. In
> any case trials would be good, instead of preconceptions, if it's not
> asking too much.
>
> Richard Lung.
>
>
>
> On 19 Jan 2022, at 6:59 pm, Kristofer Munsterhjelm <km_elmet at t-online.de>
> wrote:
>
>
> > On 19.01.2022 19:48, Richard Lung wrote:
> >
> > Treating an election as a statistic, binomial stv is monotonic and
> > strategy-resistant. I would guess that all run-off methods, which
> > actually includes traditional stv, are non-monotonic, in principle.
>
> Unfortunately, without an implementation, I can't verify that claim; and
> since no STV method I've seen so far have been proven to be monotone, I
> would find it surprising if this were the case.
>
> It would of course be good if it were true! But I have no way of
> determining that.
>
> -km
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