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Yep. Actually the behavior of IRV is extremely unintuitive (despite how nice it sounds). Even using very simple models that assume every voter has political opi

Yep. Actually the behavior of IRV is extremely unintuitive (despite how nice it sounds). Even using very simple models that assume every voter has political opinions completely described by a 2d political compass, prefers candidates that are closer to them on the compass, and that voters are normally distributed around a central point, you get very strange behavior! Here are some diagrams that illustrate the effect: https://rangevoting.org/IEVS/Pictures.html https://rangevoting.org/IEVS/Pictures.html interestingly, IRV is not even monotonic! It's easy to construct a situation where converting people to have the same ranking as you causes you to get a candidate you like less. (The concave parts of the voronoi diagrams describe areas where this happens.) If you're curious about this, a few years back some friends and I tried to make a video describing this phenomenon: [0]. (Our editing and presentation skills are nothing to write home about but I think the video is interesting.) [0]: https://www.youtube.com/watch?v=0m7vtt9jXpM https://www.youtube.com/watch?v=0m7vtt9jXpM

throw_away 4y ago
Here is another, interactive explanation of this phenomenon in IRV, as well as some alternatives that do not suffer this issue: https://ncase.me/ballot/ https://ncase.me/ballot/
panick21_ 4y ago
I don't understand why Ranked is so popular. Range voting is just easier and better in every single way.
- dllthomas 4y ago
  > better in every single way. Range can't satisfy Condorcet (that is, if there is a candidate that would win every head-to-head, that candidate should win the election). Of course, the most common approaches to RCV also fail that criterion, but it's potentially a way some ranked methods are better than range methods.
  - panick21_ 4y ago
    > Range can't satisfy Condorcet That is not necessary a desirable feature. If that is desirable or not depends on your value system of what elections should achieve. What is 'fair' or 'correct' is not universal.
    - dllthomas 4y ago
      Granted, but it seems a reasonable enough thing to ask for that "better in every single way" deserves qualification.

throw_away 4y ago

Here is another, interactive explanation of this phenomenon in IRV, as well as some alternatives that do not suffer this issue: https://ncase.me/ballot/ https://ncase.me/ballot/

panick21_ 4y ago

I don't understand why Ranked is so popular. Range voting is just easier and better in every single way.

dllthomas 4y ago
> better in every single way. Range can't satisfy Condorcet (that is, if there is a candidate that would win every head-to-head, that candidate should win the election). Of course, the most common approaches to RCV also fail that criterion, but it's potentially a way some ranked methods are better than range methods.
- panick21_ 4y ago
  > Range can't satisfy Condorcet That is not necessary a desirable feature. If that is desirable or not depends on your value system of what elections should achieve. What is 'fair' or 'correct' is not universal.
  - dllthomas 4y ago
    Granted, but it seems a reasonable enough thing to ask for that "better in every single way" deserves qualification.