[Taxacom] sloppy cladistic analyses

[Stephen Thorpe]

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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