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I'd look at the overlap of the two clusters; however, its next to impossible to say two things are the same statistically, only that they are not significantly different. If you want to make a qualitative statement, then visually overlapping the two clusters should be sufficient. 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 ===================== 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. On Fri, Jul 27, 2012 at 5:11 AM, Natalia Estévez <[log in to unmask]> wrote: > Dear experts > > I have a question concerning the peak of activation. When you compare the > coordinates of peak of activation in a region between sessions how much can > differ the coordinates so that I can still say that the activation observed > is the same. I’m looking only at the activation in anatomical ROIs ( define > with Anatomy Toolbox) so I know that the coordinates I extract belongs to > the same region but can I say that for example -41 -21 59 is the same as -14 > -32 71? Is there any good rules? > > > > For your help I thank you in advance, > > All the best, > > Natalia > >