[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Clarification of scope of paleoart->uses
I'd go further. I think it's important to retain
parsimony-uninformative characters for two reasons.
The obvious one is that, if someone goes on to build on your matrix,
the new taxa they add may make the previously uninformative
That's not a reason to already have them in the matrix.
[...] The autapomorphies in Wilson's list are of two kinds: those
that are homoplastic in the phylogenetic analysis, and which are
therefore autapomorphic only in specific cladograms; and others that
were not included in the analysis. The appendix's introduction
doesn't spell it out, but I am guess that many if not all of these
were discovered as parsimony-uninformative characters.
This, too, is not a reason to keep such characters in the matrix.
Keeping them in has disadvantages. It makes your matrix appear bigger
than it is (...impressive as it is, of the 720 characters in the
supermatrix by Sigurdsen & Green  only 335 are informative; no
surprise, because they only kept those 25 taxa, out of something like
110 or 120, that are represented in all three input matrices...), and it
increases the CI. Fine, PAUP* will give you the CI with and without
parsimony-uninformative characters, but it seems to be normal to report
the former instead of the latter and thus make the trees look more
robust than they are. And of course, the bigger a matrix, the more
opportunities there are for glitches.