[Mesquitelist] root-fixing for BiSSE?

[Wayne Maddison]

The only way to fix the state at a node is by adding a dummy taxon 
with that state and attaching it to the tree next to the node of 
interest, and making the connecting branch lengths very very short, 
effectively forcing the node of interest to have that state.

Wayne

At 1:55 PM -0500 18.11.2009, Allyson Fenwick wrote:
>Wondering if anyone has a script or tips on how to fix a particular 
>node (root or other node) to a single character state in BiSSE, as 
>is needed for a robust test of Dollo's Law.
>
>Thanks for the help,
>Allyson
>
>Allyson Fenwick
>Ph.D. Candidate
>Department of Biology
>University of Central Florida
>
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>Mesquitelist at mesquiteproject.org
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-- 
--------------------------------------------------------
Wayne Maddison
  Professor and Canada Research Chair
          Depts. of Zoology and Botany and
          Biodiversity Research Centre
  & Director
          Beaty Biodiversity Museum
  6270 University Boulevard
  University of British Columbia
  Vancouver, BC  V6T 1Z4   Canada

email: wmaddisn at interchange.ubc.ca   FAX: +1 604 822-2416

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