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Yep. Your contrast is correct [1 -1 0; 0 1-1]. On Friday, April 13, 2012, Daniel Ferreira wrote: > Thank you very much Donald for your promptly answer. > > Yes, in my model each column has 1s and 0s indicating the group > membership. And what I understand then is that there is not any problem > with the non-orthogonality here, am I right? Please, I need to be sure with > this matter. > > About the correction for multiple comparisons in the post hoc analyses > thank you very much, the answer is very clear. > > Thanks again > > Daniel > > -- Best Regards, Donald McLaren ================= D.G. McLaren, Ph.D. Postdoctoral Research Fellow, GRECC, Bedford VA Research Fellow, Department of Neurology, Massachusetts General Hospital and Harvard Medical School Website: http://www.martinos.org/~mclaren Office: (773) 406-2464 ===================== This e-mail contains CONFIDENTIAL INFORMATION which may contain PROTECTED HEALTHCARE INFORMATION and may also be LEGALLY PRIVILEGED and which is intended only for the use of the individual or entity named above. If the reader of the e-mail is not the intended recipient or the employee or agent responsible for delivering it to the intended recipient, you are hereby notified that you are in possession of confidential and privileged information. Any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited and may be unlawful. If you have received this e-mail unintentionally, please immediately notify the sender via telephone at (773) 406-2464 or email.