Loomio
Tue 10 Apr 2018 5:40AM

Multi-winner adaption of STAR voting

PF parker friedland Public Seen by 29

SRV-PR (the method that is most commonly brought up when disusing the proportional multi-winner version of STAR voting) is not even proportional. If you want further proof of this, check out the example Warren created where it can fail to elect a Democrat when 49% of voters give a max score to the Democrat and min stars to the Republicans: https://groups.google.com/forum/#!searchin/electionscience/proportional$20srv$3F%7Csort:date/electionscience/aOMyxkoey4Q/KepDTrY7AwAJ (the example is mentioned in Warren's first comment in the linked discussion). It can meet relaxed definitions of proportionality in which each party runs clone candidates equal to the number of seats up for grabs, however the only reason these relaxed definitions of proportionality work is because they rely on candidate cloning which is something that turns SRV-PR into RRV just like it turns STAR into score.

Obviously STAR voting advocates shouldn't advocate for a broken "proportional" voting method that isn't even proportional. But they still need a proportional multi-winner version of STAR voting method that they can mention to as a long term goal when ever the topic of proportionality comes up.

Here is a discussion about what that method should be: https://groups.google.com/forum/#!topic/electionscience/HkgoqQiGN4k

PF

Poll Created Tue 10 Apr 2018 5:52AM

Harmonic Voting + Runoff Closed Tue 3 Nov 2020 8:04AM

Harmonic voting ( http://scorevoting.net/QualityMulti.html ), except that between the outcomes with the highest quality according to harmonic voting's quality function, hold an automatic runoff between those two outcomes where everybody's vote automatically goes to the outcome out of the two that had candidates that the voter gave a higher scores on average too.

Results

Results Option % of points Voters
Agree 33.3% 1 PF
Abstain 33.3% 1 SW
Disagree 33.3% 1 AZ
Block 0.0% 0  
Undecided 0% 0  

3 of 3 people have participated (100%)

PF

parker friedland
Agree
Tue 10 Apr 2018 6:03AM

If any of the these methods could be considered the "natural" multi-winner adaption of STAR voting, it would be this one.

SW

Sara Wolf
Abstain
Tue 1 May 2018 8:58AM

I'm lost.

AZ

Adam Zielinski
Disagree
Tue 4 Jun 2019 12:56AM

Too complicated

PF

Poll Created Tue 10 Apr 2018 5:55AM

Combination of RRV type proportionality + STV type proportionality Closed Tue 3 Nov 2020 8:04AM

Duplicate each vote so you have two versions of everybody's ballot (you don't have to actually duplicate each person's ballot, but it is easier to explain it this way). We shall refer to these two parts as two different types of votes: score votes and a preference votes. One of the two ballots will be used for scores and the other will be used for the runoffs. Each round, use the score votes to pick the top 2 candidates and the preference votes to chose which of the two candidates gets elected that round. Each round, the score votes are re-weighted using the RRV re-weighting equation. However, the preference votes will not be re-weighted. Instead, a droop quota % of the preference votes that preferred the runoff winner will be exhausted (and the % of those votes chosen for exaustion will be the % that gave the highest difference in scores to each of those two candidates that made it to the runoff).

Results

Results Option % of points Voters
Agree 25.0% 1 PF
Abstain 50.0% 2 SW WW
Disagree 25.0% 1 AZ
Block 0.0% 0  
Undecided 0% 0  

4 of 4 people have participated (100%)

PF

parker friedland
Agree
Tue 10 Apr 2018 6:05AM

Not as good as harmonic voting + runoff, but it might be the best sequential (round based) multi-winner adaptation of STAR in which the STAR method is still used in each round.

SW

Sara Wolf
Abstain
Tue 1 May 2018 9:00AM

This sounds like an interesting line of questioning. It sounds like this would result in an algorithm that is twice as complex as either though. And how different are the results of RRV vs STV anyways?

AZ

Adam Zielinski
Disagree
Tue 4 Jun 2019 12:54AM

Too complicated

PF

Poll Created Tue 10 Apr 2018 5:58AM

RRV but elect the last winner via STAR voting Closed Wed 4 Nov 2020 6:03AM

RRV but elect the last winner via STAR voting

Results

Results Option % of points Voters
Agree 66.7% 2 AZ PF
Abstain 33.3% 1 SW
Disagree 0.0% 0  
Block 0.0% 0  
Undecided 0% 0  

3 of 3 people have participated (100%)

PF

parker friedland
Agree
Tue 10 Apr 2018 6:08AM

It's technically a multi-winner adaption of STAR voting. It may resemble RRV a lot more then STAR, but it doesn't have any of the flaws SRV-"PR" has.

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