prob. vs. poss., again...

Ulf Nordlund (
Fri, 1 May 1998 12:08:48 +0200 (MET DST)

Hi all,

I have a problem explaining the difference, _in_practice_, between
probability and possibility. I think I understand it pretty well myself,
but I want some advice on how to best explain it to others.

I don't mean general examples. There are some good ones of those around
(e.g. the two bottles offered to a very thirsty man, or the half-eaten
apple..). It's more the problem of explaining the difference between
probability and possibility when the fuzzy sets (i.e. their membership
functions) are based on statistical data such as census counts. (One has
to admit that the boundary between probability and possibility in this
case becomes a bit "fuzzy"...)


   Ulf Nordlund, Inst. of Earth Sciences
   Uppsala University, Sweden