Hi Donald,thank you for giving the advice, I Seen somebody made the constrast using F0 0 -0.5 0.50 0 0.5 -0.5what is different between T and F?thank you!BoAt 2015-07-01 09:33:39, "MCLAREN, Donald" <[log in to unmask]> wrote:
Use a two-sample t-test with a covariate that interacts with factor 1.Contrast should be [0 0 1 -1].This will test for the difference in slopes.
Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Postdoctoral Research Fellow, GRECC, Bedford VA
Website: http://www.martinos.org/~mclaren
Office: (773) 406-2464
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On Tue, Jun 30, 2015 at 8:44 PM, xiangbo_2010 <[log in to unmask]> wrote:
Hi everyone,I want to perform an interaction between age and diagnosis (case and control) on the volume of gray matter, should I how to do it? and how to design contrast? thank you so much!Bo