When I spoke of Tideman as a possible alternative to SSD or CSSD in public proposals, I was referring to Tideman(wv) only.
Since "Ranked Pairs" is the term more widely used here, I suppose I should use it too. I abbreviate it "RP". I neglected to add in my previous letter that RP(wv), like SSD & CSSD, meets all 4 majority defensive strategy criteria, SFC, GSFC, WDSC, & SDSC. Since anything that meets GSFC also meets SFC, and anything that meets SDSC also meets WDSC, it would be sufficient to just tay that SSD, CSSD, & RP(wv) all meet GSFC & SDSC. Also, RP(wv) meets the Independence from Clones Criterion (ICC), as does CSSD. SSD is efectively clone-independent in public elections, because pair-ties are rare there. As I said, I don't suggest RP for small committees because it's more awkward to program for those applications. What I was emphasizing in my previous letter was the differences between CSSD, SSD, & RP(wv). In small committees RP can choose outside the initial Schwartz set, and ordinary SSD isn't clone-independent. CSSD has neither of those problems even in small committees. In public elections RP & SSD don't have those problems. The other difference, as I was saying, is that when RP chooses a different winner from that of SSD or CSSD, RP's winner more often than not pair-beats the other method's winner. I suggest that the merits of SSD, CSSD, & RP(wv) are so nearly equal for public elections that the choice of which of those to propose should be based entirely on which one is more likely to be accepted. Also, I should add that my girlfriend listened to my explanation of the Schwartz set because I'd asked her to give it a fair hearing, to test the definition. If someone had come up to her on the street with an initiative, that might have been different. The test suggests that the Schwartz set won't be a problem to people who've had no contact with voting systems, and that it will be accepted if the person listens to the explanation. Of course RP(wv) has the advantage that it's definition just starts right out with the procedure, without a preliminary definition of the Schwartz set. If there's a question about how much people will listen to or read, then maybe RP(wv) has the advantage there. But, as I said, finding out which is more acceptable will depend on polling. Mike Ossipoff _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp.
