RASA 2.4 -negative tRASA
xianjenn at ISU.EDU
Tue Nov 7 11:56:24 CST 2000
> Dear All,
> I use RASA to examine phylogenetic signals in a data matrix and to detect
> potential long branches. The analysis gave me a negative value of tRASA (the
> observed slope is smaller than the null slope). I wonder how I should
> interpret this result.
> Does it mean that the pairwise synapomorphies decrease as the pairwise
> similarities increase? If tRASA
> is - 16.60314 for df = 1221, should this tRASA be significant since the
> absolute value of this tRASA is greater than the critical value (1.96 for df
> > 120 at p = 0.05)?
> I tried to contact Dr. Lyons-Weiler, the author of RASA, but my email was
> undeliverable to the address provided in the manual. Help from any of your
> will be very much appreciated!
Jenny Qiu-Yun Xiang
Department of Biological Sciences
Idaho State University
Pocatello, ID 83209-8007
e-mail: xianjenn at isu.edu
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