[EM] An idealized DSV method in the spirit of XA

[Forest Simmons]

Vote score ballots.

For each ballot B the method is used recursively to determine what the
average scores of the candidates would be if that ballot were not included
in the election.  Then the scores of ballot B are adjusted to B' so that if
it (B') were averaged in (as one additional ballot, weighted accordingly)
it would improve the previous averages (towards the ratings of ballot B) as
much as possible.

The final ratings arre the average scores of the respective adjusted
ballots.

This method is almost surely intractable computationally, but it has the
spiit of XA.  I believe that for a large diverse collection of Score
ballots XA would give an excellent approximation to the result of this
recursive method.
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