Re: News re preference voting or IRV

From: Douglas W. Jones <jones_at_cs_dot_uiowa_dot_edu>
Date: Mon Apr 04 2005 - 14:57:50 CDT

On Apr 4, 2005, at 10:41 AM, Joseph Lorenzo Hall wrote:

> On Apr 4, 2005 8:34 AM, Edmund R. Kennedy <ekennedyx@yahoo.com> wrote:
>> http://www.govtech.net/news/news.php?id=93516
>
> This is not necessarily good news. Do OVC folks understand that IRV
> voting (which this article calls "preference voting") is
> non-monotonic?

We need to make sure that people understand that ranked preference
ballots can be counted in many ways. Ranked preference ballots merely
mean that the voter, when presented with more than two alternatives,
is allowed to express not only their first-choice preference, but also
their second choice, and so on.

Once you have, in hand, a pile of ranked preference ballots, you can
count them to determine who won the election. There are many ways of
doing so. IRV is one of them. The Condorcet method is another. The
Borda count is yet another.

Clearly, the vote gathering mechanism should not commit you to one or
the other of these ballot counting systems. One is a matter of
gathering,
from voters, the order of their preferences among the list of
candidates,
while the other determines what you do with those lists of preferences
once they have been collected.

The American Mathematical Society has a nice web page on this issue:
http://www.ams.org/new-in-math/cover/voting-decision.html

                Doug Jones
                jones@cs.uiowa.edu

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Received on Sat Apr 30 23:17:01 2005

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