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G*Power is an excellent program. Also see: http://fmripower.org/ One reason that power is not usually included is that it is technically invalid to compute the power of your current sample. That is to say, you can't use the current data to determine the power of your analysis. Power analyses need to be done prior to the experiment. However, you could use power calculations of your current paper to say how many subject you need in future experiments as I reported in McLaren et al. 2010. 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. On Fri, Mar 23, 2012 at 2:15 PM, Kailyn Bradley <[log in to unmask]>wrote: > Dear all, > > I am designing an fMRI study and want to do some kind of power analysis to > figure out the number of subjects that I need. I have not ever seen any > type of analysis like this in any of the fMRI papers I have read. Does > anyone have any suggestions for resources I could read or analysis programs > that would be helpful on this matter? > > Thanks, > Kailyn > >