tree length, ci, ri

Michael A. Charleston m.a.charleston at mail.utexas.edu
Wed May 10 21:34:49 EST 1995


In article <D8CqKD.2rn at zoo.toronto.edu>, mes at zoo.toronto.edu (Mark
Siddall) wrote:

> In article <3okk7g$ab7 at mserv1.dl.ac.uk> "Essop, FM, Dr"
<MFESSOP at chempath.uct.ac.za> writes:
> >I have done some restriction mapping and constructed cladograms using 
> >Hennig86.  I am not sure what the following values indicate: 
> 
> Oh my! _quae nocent docent_
> I see we have much work to do here.  
> My first comment is that your non-understanding suggests that you are one
> who has simply stuck things into Hennig86 without sound knowledge of
> the foundations and philosophies of phylogeny reconstruction.
> A little knowledge is dangerous and I would highly reccomend that you
> spend a lot of time becoming learned.
> That said I will answer your queries albeit _in extenso_...

Sorry, but I really don't think it's necessary to be rude about it.



> (lots of other stuff)

> >iii) tree length - what for eg. does a tree length of 307 compared to 
> >288 mean ?  How does one "decide" what the best tree is - based on 
> >tree length ?
> 
> If you used Hennig86 (properly) you will have got the shortest tree.
> This is the most parsimonious tree.
> This is the best tree.

Really?  Why?




Mike



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