part 6, 1st Choice Criterion
ntk at netcom.com
Wed Nov 4 18:20:21 PST 1998
There's also a class of methods called the "pairwise-count"
or "pairwise" methods. They start out:
Voters rank as many candidates as they wish. A beats B if
more voters rank A over B than vice-versa. If 1 candidate beats
each of the others, he wins.
Sometimes there isn't such a candidate. When there is, he's
a CW. When there isn't, however, that doesn't necessarily
mean there isn't a CW. Maybe there is one, but he's losing
his win due to truncation or order-reversal.
Truncation means voting a short ranking rather than ranking
Order-reversal means strategic reversal of a preference ordering.
In general, pairwise methods fail weak & strong versions
of the 1st Choice Criterion. Truncation is all it takes
to makek them fail the strong version. Order reversal makes
them fail the weak version.
More information about the Election-Methods