Alan Harvey aharvey at AMNH.ORG
Thu Feb 27 10:15:54 CST 1997

James Lyons-Weiler wrote:

>Consider the fact that when one decides to not weight morphological (or
>molecular) characters, one has decided that a transformation among states
>is character i has then same information (and therefore relative
>probability) as a transformation among states in character j.  That is, a
>decision to use equaly weight is arbitrary, and requires as much
>justification as any weight weighting scheme...

So how's this? "I have no a priori evidence, or other reason to suspect,
that any (much less which) of my characters are more informative than
others?" Granting that "unweighted" characters do in fact have a weight of
one, I'd still say that a prima facie case exists for "oneweighting"
characters as your default condition.




Alan W. Harvey (aharvey at amnh.org)
Assistant Curator of Invertebrates
American Museum of Natural History
Central Park West at 79th Street
New York, NY 10024
(212) 769-5638; fax (212) 769-5783

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