Wow!  Thank you for this information!

Did you parse and tally this yourself?  Do you have the actual pairwise tallies?

I'm only coding in MATLAB of late.  I am cringing at writing decent code to parse this.

robert

--

r b-j . _ . _ . _ . _ rbj@audioimagination.com

"Imagination is more important than knowledge."

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On 9/14/22 23:28, Andy Dienes wrote:

Looks right! Nice! I've attached the ballots in the more familiar EM format.

If we eliminate everybody but the Smith set, the ballots become:

1572: Arab
775: Arab>Gordon
133: Arab>Gordon>Worlobah
592: Arab>Worlobah
164: Arab>Worlobah>Gordon
822: Gordon
596: Gordon>Arab
205: Gordon>Arab>Worlobah
843: Gordon>Worlobah
334: Gordon>Worlobah>Arab
492: Worlobah
750: Worlobah>Arab
338: Worlobah>Arab>Gordon
852: Worlobah>Gordon
447: Worlobah>Gordon>Arab

There's an Arab>Gordon>Worlobah>Arab cycle. Schulze and Minmax-type
methods elect Arab (whether restricted to the Smith set or not). fpA-fpC
restricted to the Smith set would give:

fpArab = 3236
fpGordon = 2800
fpWorlobah = 2879

score(Arab) = 3236 - 2879 = 357
score(Gordon) = 2800 - 3236 = -436
score(Worlobah) = 2879 - 2800 = 79

and thus elect Arab. Smith//IRV would eliminate Gordon and then Worlobah
beats Arab pairwise.

At least plain IRV chose a Smith set member here! But most of the actual
Condorcet methods prefer Arab.

The first preferences before elimination are:
fpAnderson = 982
fpArab = 2719
fpGaskin = 546
fpGordon = 2508
fpUWI = 9
fpWorlobah = 2763

So Friendly Cover would go: all Smith set members cover all the
non-Smith members, so everybody has {Anderson, Gaskin, UWI} as friends,
with a first preference sum of 1537. Then
Arab has himself as friend and Worlobah as defeater.
Score = 2719 + 1537 - 2763 = 1493
Gordon has himself as friend and Arab as defeater.
Score = 2508 + 1537 - 2719 = 1326
Worlobah has himself as friend and Gordon as defeater.
Score = 2763 + 1537 - 2508 = 1792,

and Worlobah wins.

So it agrees with Smith//IRV but not with itself restricted to the Smith
set, hence failing ISDA. I'm inclined to believe that Arab is the right
choice since so many other methods agree.

-km

On 9/15/22 13:05, Kristofer Munsterhjelm wrote:

Just a correction to myself: my parser used the last word of the
candidate's listed name as the short candidate name. But apparently the
CSV uses a "First Last Middle" mixed-endian format for names. Thus
Worlobah should be Wonsley: https://en.wikipedia.org/wiki/Robin_Wonsley

-km

It's interesting that there was mandatory truncation in the election:
voters were asked to rank "up to three candidates". That is something i
hadn't considered in another thread.
   CJC

On 15/09/2022 12:05, Kristofer Munsterhjelm wrote:

On 9/15/22 13:31, Kristofer Munsterhjelm wrote:

Whoops, I need to make another correction, in the Friendly Cover example:

That should be "herself".

And

Also herself.

Both Yusra Arab and Robin Wonsley are women.

-km

You may find this paper interesting.

[2111.09846] The Curious Case of the 2021 Minneapolis Ward 2 City Council
Election

https://arxiv.org/abs/2111.09846

On Thu, Sep 15, 2022, 7:22 AM Kristofer Munsterhjelm km_elmet@t-online.de
wrote: