[Mesquitelist] PDAP t-test: t-values

[James Schulte]

Dear Mesquite, 

I have a student working on a dataset trying to correlate two continuous variables. After calculating the positivized contrasts and plotting them against one another, we get a t-value on the order of 12.13 which is significant for these data. However, when the positivized values are exported to Origin 8 and a t-test is performed the t-value is only on the order of ~1.6.  Does the t-value seem high in Mesquite or am I completely missing something in my evaluation of the t-test in PDAP?

Thank you for any help and the file is attached.

Cheers,
Jim
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James A. Schulte, II
Department of Biology
177 Clarkson Science Center, MRC 5805
8 Clarkson Avenue
Clarkson University
Potsdam, NY  13699-5805
Phone:  315-268-4401
Fax:  315-268-7118