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Methodology Questions >> How to >> non-reversible models http://www.hyphy.org/cgi-bin/hyphy_forums/YaBB.pl?num=1240248653 Message started by weli on Apr 20th, 2009 at 10:30am |
Title: non-reversible models Post by weli on Apr 20th, 2009 at 10:30am
hello,
I'm working with some data where the ancestor is known independently (alignments between ancestral transposons and modern sequence). I would like to determine rate parameters in as much detail as possible, ideally all 12 nondiagonal rates. I think this means I want a non-reversible model. Is this possible to do in HYPHY? If so, is there some way I need to indicate which sequence is the ancestor? thanks! |
Title: Re: non-reversible models Post by wayne on Apr 20th, 2009 at 11:45am
and use
ACCEPT_ROOTED_TREES = 1; in your batch file. ./w |
Title: Re: non-reversible models Post by weli on Apr 20th, 2009 at 2:24pm
Thanks, that helps a lot. One more question about specifying an ancestor.
I did the following ACCEPT_ROOTED_TREES = 1; Tree Tr = (anc,der); which gives me this output: Tree Tr=(anc:0.125158,der:0.195086); It looks like its put the root somewhere between anc and der, and is still treating them as tips. I want to force it to make anc the ancestor. Is there any way to do that? thanks again. |
Title: Re: non-reversible models Post by wayne on Apr 20th, 2009 at 3:13pm
hi, a two taxon tree is by default unrooted. However, in your case you can force an ancestor by constraining the branch length of the ancestor to be 0.
ie. Tr.anc.t := 0; ./w |
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