[Taxacom] sloppy cladistic analyses

[John Grehan]

Where zero = uninformative. Sure. John Grehan


> -----Original Message-----
> From: Stephen Thorpe [mailto:s.thorpe at auckland.ac.nz]
> Sent: Thursday, February 04, 2010 6:50 PM
> To: John Grehan; Taxacom
> Subject: RE: [Taxacom] sloppy cladistic analyses
> 
> sounds like an all or nothing zero or 100% weighting, where you don't
even
> mention the zero ones ...
> 
> ________________________________________
> From: taxacom-bounces at mailman.nhm.ku.edu [taxacom-
> bounces at mailman.nhm.ku.edu] On Behalf Of John Grehan
> [jgrehan at sciencebuff.org]
> Sent: Friday, 5 February 2010 1:57 a.m.
> To: Taxacom
> Subject: Re: [Taxacom] sloppy cladistic analyses
> 
> Not sure. In the recent hominid analysis I treated all potential
> synapomorphies equally. On the other hand, I limited the data to only
> putative synapomorphies so is that weighting?
> 
> John Grehan
> 
> 
> > -----Original Message-----
> > From: Stephen Thorpe [mailto:s.thorpe at auckland.ac.nz]
> > Sent: Wednesday, February 03, 2010 10:12 PM
> > To: John Grehan; Taxacom
> > Subject: RE: [Taxacom] sloppy cladistic analyses
> >
> > I think Grehan is talking about character weighting, in essence ..
are
> you
> > John, my friend?
> >
> > ________________________________________
> > From: taxacom-bounces at mailman.nhm.ku.edu [taxacom-
> > bounces at mailman.nhm.ku.edu] On Behalf Of John Grehan
> > [jgrehan at sciencebuff.org]
> > Sent: Thursday, 4 February 2010 3:56 p.m.
> > To: Taxacom
> > Subject: Re: [Taxacom] sloppy cladistic analyses
> >
> > -----Original Message-----
> > From: taxacom-bounces at mailman.nhm.ku.edu
> > [mailto:taxacom-bounces at mailman.nhm.ku.edu] On Behalf Of Jason Mate
> >
> >
> > "...'law of large numbers' that overrules the 'law of shared derived
> > characters'..." They are not laws, they are more like guidelines...
> > Seriously, the old quality versus quantity?
> >
> > In a way yes. The 'law of large numbers' characterizes the
> perspectives
> > of many systematists, particularly molecularists, but also many
> > morphologists, that large numbers of characters somehow gives one
more
> > likelihood of the right answer. I coined the 'law of shared derived
> > characters' a bit facetiously as a contrast in that its not a matter
> of
> > simply having a 'lot' of characters but having informative
characters.
> >
> > John Grehan
> >
> > _______________________________________________
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