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Technical discussion of election methods

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Oops! MMPO & 3-Slot ICT fail CD :^D

MO
Michael Ossipoff
Wed, Sep 21, 2016 1:34 AM

Today I told how the B voters can betray in U/P.

They can do the same thing in MMPO & ICT:

They can rank C over A.  ...and thereby win.

CD's premise doesn't exclude that.

Change CD to condone that? What would be the point? The betrayal would
still be there.

Maybe there could be a weak CD, but it wouldn't mean much.

Michael Ossipoff

Today I told how the B voters can betray in U/P. They can do the same thing in MMPO & ICT: They can rank C over A. ...and thereby win. CD's premise doesn't exclude that. Change CD to condone that? What would be the point? The betrayal would still be there. Maybe there could be a weak CD, but it wouldn't mean much. Michael Ossipoff
C
C.Benham
Wed, Sep 21, 2016 3:19 AM

Mike,

Today I told how the B voters can betray in U/P.

They can do the same thing in MMPO & ICT:

They can rank C over A.  ...and thereby win.

I don't see how that is the case under ICT  (aka  TTR,TR), for example:

34 C
33 A>B
32 B>C  (sincere is B>A)

C>A 66-33,  A>B 33-32,  B>C  65-34.

TR scores:  C34,  A33,  B32

On no ballots is more than one candidate voted equal-top. No candidate
pairwise beats all the others so
TTR disqualifies no-one and C has the highest TR score so C wins.

MMPO scores:  B34,  C65,  A66.

Yes,  B has the lowest score and so wins.

Chris  Benham

On 9/21/2016 11:04 AM, Michael Ossipoff wrote:

Today I told how the B voters can betray in U/P.

They can do the same thing in MMPO & ICT:

They can rank C over A.  ...and thereby win.

CD's premise doesn't exclude that.

Change CD to condone that? What would be the point? The betrayal would
still be there.

Maybe there could be a weak CD, but it wouldn't mean much.

Michael Ossipoff


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Mike, > Today I told how the B voters can betray in U/P. > > They can do the same thing in MMPO & ICT: > > They can rank C over A. ...and thereby win. > I don't see how that is the case under ICT (aka TTR,TR), for example: 34 C 33 A>B 32 B>C (sincere is B>A) C>A 66-33, A>B 33-32, B>C 65-34. TR scores: C34, A33, B32 On no ballots is more than one candidate voted equal-top. No candidate pairwise beats all the others so TTR disqualifies no-one and C has the highest TR score so C wins. MMPO scores: B34, C65, A66. Yes, B has the lowest score and so wins. Chris Benham On 9/21/2016 11:04 AM, Michael Ossipoff wrote: > > Today I told how the B voters can betray in U/P. > > They can do the same thing in MMPO & ICT: > > They can rank C over A. ...and thereby win. > > CD's premise doesn't exclude that. > > Change CD to condone that? What would be the point? The betrayal would > still be there. > > Maybe there could be a weak CD, but it wouldn't mean much. > > Michael Ossipoff > > > > ---- > Election-Methods mailing list - see http://electorama.com/em for list info > > > No virus found in this message. > Checked by AVG - www.avg.com <http://www.avg.com> > Version: 2016.0.7797 / Virus Database: 4656/13054 - Release Date: 09/20/16 >