Reweighted range voting: Difference between revisions
Content added Content deleted
mNo edit summary |
(Added python for RRV. Same code as SPAV roughly.) |
||
| Line 1: | Line 1: | ||
<br> |
|||
<br> |
|||
[[File:RRV Procedure.svg|thumb|RRV Procedure]] |
[[File:RRV Procedure.svg|thumb|RRV Procedure]] |
||
| Line 35: | Line 37: | ||
# The remaining candidate with the highest total reweighted score wins each seat available- up until the final seat up for election. |
# The remaining candidate with the highest total reweighted score wins each seat available- up until the final seat up for election. |
||
# For the final seat available, the two highest-scoring candidates remaining runoff, with the candidate preferred (scored higher) by more reweighted ballots winning the final seat. |
# For the final seat available, the two highest-scoring candidates remaining runoff, with the candidate preferred (scored higher) by more reweighted ballots winning the final seat. |
||
==Example Code== |
|||
<syntaxhighlight lang="python" line> |
|||
import pandas |
|||
ballots = [ |
|||
{"Red": 5, "Green": 0, "Yellow": 3, "Blue": 5}, |
|||
{"Red": 5, "Green": 0, "Yellow": 0, "Blue": 4}, |
|||
{"Red": 0, "Green": 5, "Yellow": 0, "Blue": 1}, |
|||
{"Red": 1, "Green": 2, "Yellow": 4, "Blue": 3}, |
|||
{"Red": 1, "Green": 0, "Yellow": 2, "Blue": 0}, |
|||
{"Red": 1, "Green": 3, "Yellow": 0, "Blue": 1}, |
|||
{"Red": 0, "Green": 0, "Yellow": 5, "Blue": 0}, |
|||
{"Red": 5, "Green": 0, "Yellow": 0, "Blue": 4}, |
|||
] |
|||
seats = 4 |
|||
seated = [] |
|||
max_score = max(max(ballot.values()) for ballot in ballots) |
|||
#reweight |
|||
def reweight(ballot): |
|||
seated_scores = [ |
|||
ballot[candidate] for candidate in ballot if candidate in seated |
|||
] |
|||
weight = 1/(1+sum(seated_scores)/max_score) |
|||
return {candidate: weight*ballot[candidate] for candidate in ballot} |
|||
def nextRound(ballots): |
|||
reweightedBallots = [reweight(ballot) for ballot in ballots] |
|||
winner = pandas.DataFrame(reweightedBallots).sum().drop(seated).idxmax() |
|||
print(pandas.DataFrame(reweightedBallots).sum()) |
|||
seated.append(winner) |
|||
return reweightedBallots |
|||
while len(seated) < seats: |
|||
nextRound(ballots) |
|||
print(seated) |
|||
</syntaxhighlight> |
|||
<syntaxhighlight lang="" line> |
|||
Red 18.0 |
|||
Green 10.0 |
|||
Yellow 14.0 |
|||
Blue 18.0 |
|||
dtype: float64 |
|||
['Red'] |
|||
Red 10.000000 |
|||
Green 9.166667 |
|||
Yellow 11.500000 |
|||
Blue 10.833333 |
|||
dtype: float64 |
|||
['Red', 'Yellow'] |
|||
Red 8.881410 |
|||
Green 8.500000 |
|||
Yellow 6.903846 |
|||
Blue 9.256410 |
|||
dtype: float64 |
|||
['Red', 'Yellow', 'Blue'] |
|||
Red 6.684219 |
|||
Green 7.078755 |
|||
Yellow 6.121795 |
|||
Blue 6.947497 |
|||
dtype: float64 |
|||
['Red', 'Yellow', 'Blue', 'Green'] |
|||
</syntaxhighlight> |
|||
==Related Systems== |
==Related Systems== |
||