Dear Simon (et al.), <br><br>I apologize - my formula was incorrect and I
can now confirm that the hand calculation of Ka and Ks both yield the
same answer as calling up $Ka and $Ks from the KaKs function - I
confirmed this with system.file data you mentioned. Sorry for the confusion. <br>
<br>Thank you!<br><br>Trevor<br><br><br><br><div class="gmail_quote">On Thu, Nov 22, 2012 at 2:30 AM, Simon Penel <span dir="ltr"><<a href="mailto:simon.penel@univ-lyon1.fr" target="_blank">simon.penel@univ-lyon1.fr</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<div>Dear Trevor,<br>
<br>
I am not using seqinr on a regular basis, so I am not sur I can
help about this problem.<br>
<br>
Concerning the way ka ks is calculated you may find the
information here:<br>
<br>
<a href="https://r-forge.r-project.org/scm/viewvc.php/pkg/src/kaks.c?view=markup&root=seqinr" target="_blank">https://r-forge.r-project.org/scm/viewvc.php/pkg/src/kaks.c?view=markup&root=seqinr</a><br>
<br>
(or directely in the sources of seqinr if you download it at
<a href="http://cran.r-project.org/web/packages/seqinr/index.html" target="_blank">http://cran.r-project.org/web/packages/seqinr/index.html</a>)<br>
<br>
Does the problem occurs with the example given in seqinr :<br>
<br>
<font face="Courier New, Courier, monospace">s <-
read.alignment(file = system.file("sequences/test.phylip",
package = "seqinr"), format = "phylip")
<br>
kaks(s)<br>
</font><br>
<br>
All the best,<br>
<br>
Simon<br>
<br>
<br>
<br>
Le 21/11/12 20:24, Trevor Krabbenhoft a écrit :<br>
</div>
<blockquote type="cite">
<pre>Hello,
I am looking for clarification on how Ka and Ks are calculated in the kaks
function. If I calculate by hand using formulas from Li 1993, i.e.:
Ka = (Ao + (LoBo + L2B2))/(Lo + L2)
Ks = (L2A2 + L4A4)/(L2 + L4) + B4
I obtain different answers than if I pull out ka and ks using $ka and $ks
e.g.,
test.k<-kaks(myalignment)
test.k$ka #ka is different here than what I calculate by hand using
$A0, $L0, $B0, etc.
#The details are buried in the kaks function in C - is there a way to 'see'
how it is calculating these? Which should I use if I want to follow Li's
method?
#Thank you for any insight.
#Trevor
</pre>
<br>
<fieldset></fieldset>
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<br>
<pre cols="72">--
Simon Penel
Laboratoire de Biometrie et Biologie Evolutive
Bat 711 - CNRS UMR 5558 - Universite Lyon 1
43 bd du 11 novembre 1918 69622 Villeurbanne Cedex
Tel: 04 72 43 29 04 Fax: 04 72 43 13 88
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ATTENTION NOUVELLE ADRESSE:
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