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Dear Donald, Thanks for your email. I think this issue was addressed in a recent posting on the SPM email list by Jan Glascher (17 Mar). See: http://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0803&L=SPM&P=R16629&I=-3 He has written a very good tutorial on this issue which you should be able to download via the above link (or email Jan directly). Best wishes, Will. MCLAREN, Donald wrote: > Will, > > I was talking to Karl today about 3 way ANOVAs and why they weren't > available in SPM. He couldn't think of any reason, but suggested that I > contact you about the issue. > > Is there any reason one can't construct a repeated measures ANOVA with 2 > within-subject factors and group factor for 2 or more groups. In the > simple case of a 2x2x3 ANOVA; you'd have 4 columns for factor1*factor2, > 6 columns for factor1*factor3, and 12 columns for > factor1*factor2*factor3. NOTE: since this is repeated measures design, > there would also be a term for each subject. Granted this is a huge > number of columns, is there any reason that this can't be performed, > either theoretically or practically? Might this option for three-way > interactions be included in SPM8? > > Any thoughts would be appreciated. > > -- > Best Regards, Donald McLaren > ===================== > D.G. McLaren > University of Wisconsin - Madison > Neuroscience Training Program > Tel: (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. -- William D. Penny Wellcome Trust Centre for Neuroimaging University College London 12 Queen Square London WC1N 3BG Tel: 020 7833 7475 FAX: 020 7813 1420 Email: [log in to unmask] URL: http://www.fil.ion.ucl.ac.uk/~wpenny/