[Taxacom] Antw:Re: Evolution of human-ape relationships, remains open for investigation

John Grehan jgrehan at sciencebuff.org
Fri Aug 12 11:20:20 CDT 2011

So what is the point you want to make with respect to Maddison et al?

John Grehan

-----Original Message-----
From: P.H. HOVENKAMP [mailto:phovenkamp at casema.nl] 
Sent: Thursday, August 11, 2011 4:57 PM
To: John Grehan; taxacom at mailman.nhm.ku.edu
Subject: Antw:Re: [Taxacom] Evolution of human-ape relationships, remains open for investigation

This is exactly the topic of the discussion in the 70ties/80ies I referred to earlier.

If this post makes it to the list: scroll down in John's previous message to find a number of references to classic papers in which this topic is treated. To which may be added a paper by Maddison, Donoghue and Maddison from 1984 on outgroups and parsimony. 

Apparently, these are still relevant, and are to be considered required reading.

Peter Hovenkamp 

Op 11/08/11, John Grehan  <jgrehan at sciencebuff.org> schreef: 

> "Binary transformation series, whether restricted in a way that one
> character state is present in the ingroup and absent in the outgroup or
> not, contribute the same number of steps to a parsimony analysis
> independently of the polarity assessment so identifying polarity in this
> characters prior to the analysis is irrelevant."
> But an algorithm cannot distinguish derived states if they are not
> specified. If one mixes in non-derived states and codes them as such,
> then no problem - but then why bother including them?
> John Grehan
> -- 
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