[EM] Ranked Ranks

Forest Simmons fsimmons at pcc.edu
Thu Jun 6 12:50:06 PDT 2019


Your question is a good one, and I am open to suggestions.

If we started out with the approval order (i.e. respecting the strongest
rank symbols), and then introduce the next strongest symbols for detecting
out of order pairs, ASM suggests we use approval margins, i.e. the margins
based on the rankings of stage one to decide which pair we should reverse.

What if we continue in that vein, in stage three we use the margins from
stage two to decide on which out-of-order adjacent pair to attend to first?

In stage n we use the margins from stage (n-1) to decide which
out-of-pairwise order (detected (by the stage n rank symbols) to fix first.

To me that seems like the most natural generalization of ASM in the Ranked
Ranks context.  But it may not be the optimal solution.


On Thu, Jun 6, 2019 at 11:02 AM Ted Stern <dodecatheon at gmail.com> wrote:

> Hi Forest!
> This is an interesting method.  It adds a Bucklin-like flavor to Approval
> Sorted Margins (https://electowiki.org/wiki/Approval_Sorted_Margins),
> which I like very much.
> By sorting pairwise, what sort do you want to use?  Are you using the ASM
> method of looking for the smallest margin and then continuing the next
> smallest margin until finished?  If so, what is the margin between?  There
> are several options.
> I suspect that if you just use total votes at and above the round's rating
> level, you will run into irrelevant ballot problems unless you use some
> variant of IBIFA. Perhaps you could use the highest total approval for a
> candidate on ballots not ranking X as their relevant opposition score.
> On Wed, Jun 5, 2019 at 7:54 PM Forest Simmons <fsimmons at pcc.edu> wrote:
>> I don't want to detract from the glory of Improved Copeland with another
>> post, but here goes:
>> A recent suggestion of Kevin was to start with all of the ranks in place,
>> and then to flatten more and more ranks (in a certain order) until a ballot
>> CW emerges.
>> Here's a way to do it in the opposite order:
>> "Annealing"
>> Start with only the strongest rank symbols in place.
>> This gives an approval order.
>> Add in the next strongest rankings, to sort the approval list pairwise.
>> Then add in more rankings, and sort again.
>> etc.
>> Until all of the rankings are used in the final sort.
>> I call it "annealing" because it is like the process of compactifying the
>> molecules in a piece of metal by repeated partial heatings and coolings.
>> It could also be called the resistant starch method, because re-heating
>> and cooling cooked rice or baked potatoes adds additional resistant starch
>> (up to a point).
>> ----
>> Election-Methods mailing list - see https://electorama.com/em for list
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