Re: xpiwe
Ivonne Garzon
Dear all,
I would like to know if anyone has used the command xpiwe. So far, I haven't seen anything published. According to a fried, there are a couple of papers using this command, which I am seeking as I type this message.
I did some test using xpiwe=] but the topology is far from my best topology obtained with regular IW. my matrix has seven partitions: continues and discrete morphology and five genes.
I would like to fine tune this command. Any suggestions anyone?
Cheers,
Edmundo
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Marcos Mirande
Hi Edmundo.
I'm also using xpiwe, but only to consider the missing entries of each character in weights calculations. With the same command you can also differentially weight blocks or group of molecular characters (i.e. aligned columns). Something that I find justifiable only with molecules, in which characters hasn't defined "horizontal limits" in the matrix (i.e. they depend on the aligning) and you usually have homoplastic "regions" which can be more or less homoplastic (=conserved), rather than particular characters (= columns).
Whichever option you use, actually, if you have many missing entries it's more possible that you will obtain different topologies using xpiwe. In my current matrix, which is only morphological, results are almost the same, because it hasn't many missing entries.
The single tip I have to give you (which I don't know if it is in the help) is the use of an asterisk instead of the hyphen used for inapplicable entries. This permit TNT to differentiate between inapplicable and missing entries. This is important because you can project possible homoplasy among the uncoded (missing) entries, but it is no-sense with the inapplicable ones.
In general, I like xpiwe and I use it "by default" now.
Cheers and success, Marcos.
Which option of xpiwe are you interested in?
I regularly use the correction of weight for chara