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One of the weird things for computer people about the Irish voting system is that it's non-deterministic! You can count the same ballots in a different order an
by dmurray 1y ago
One of the weird things for computer people about the Irish voting system is that it's non-deterministic! You can count the same ballots in a different order and get a different result (because it depends which votes you choose as "surplus" to redistribute).
In practice it doesn't seem to matter that much. The counters even out the first-level effects of this, so it only matters for votes that have been transferred more than once; it can be determined statistically that it changes the result only in a very small number of cases; and there are plenty of other weird threshold effects to care about instead. But it's one property you might expect of a fair voting system that Ireland doesn't give you.
- lucideer 1y agoYeah. I think it's the best voting system in the world because I've yet to encounter one I think is better but you're right, it's far from perfect. That said, surplus distribution tends to be the main flaw raised time & time again, & whenever improvements are discussed the general conclusion tends to be that the current distribution mechanism goes a very long way toward fair representation of the actual preference distribution. It's notable that the more computationally intensive alternatives to get "fairer" outcomes are pretty recent inventions & it's really hard to justify the effort given the tiny number of cases affected.