[EM] SSD and BeatpathWinner
nkklrp at hotmail.com
Tue Nov 25 22:38:01 PST 2003
When Mike means Schwartz Sequential Dropping (aka Beatpath
Method) with "Condorcet's method"
But I didn't say that that's all that I mean by Condorcet's method. There
are a number of good versions of Condorcet's method. Here are some of them:
Schwartz Sequntial Dropping (SSD)
Cloneproof SSD (CSSD)
Plain Condorcet (PC)
Sequential Dropping (SD)
Cloneproof SSD (CSSD) and BeatpathWinner are equivalent, always giving the
Strictly speaking, SSD isn't the same as BeatpathWinner. But in public
elections, SSD will choose the same as CSSD. SSD is more natually and
intuitively defined than CSSD, because the SSD count stops when a candidate
I recommend BeatpathWilnner/CSSD for committees, polls, and organizations,
because of its elegantly brief algorithm and coimputer program, and its
freedom from the midcount ties that RP can have in committees, where equal
defeats can occur.
But RP's brief definition (when midcount ties aren't mentioned) makes it a
contender for public elections.
I've mentioned all this here before, but once I described SSD and SD to
someone complertely new to voting systems. She understood and liked SSD. She
liked SSD considerably better than SD. SD and RP mention cycles in their
definitions, but SSD doesn't mention cycles. Very likely, innermost unbeaten
sets are more intuitive and compelling than cycles, for someone new to
voting systems. And probably are also more compelling and obvious in their
motivation and justification than beatpaths comparisons.
Need a shot of Hank Williams or Patsy Cline? The classic country stars are
always singing on MSN Radio Plus. Try one month free!
More information about the Election-Methods