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Hello Donald and SPM users, I am trying to run a flexible factorial model but I keep getting the following error. Error using ==> spm_meanby at 31 row dimension mismatch between inputs I think the problem is how I am defining the Factor Matrix but not sure. I would appreciate any help. Here is how the model is set up. I have three groups (n1=4, n2=16, n3=6) and two conditions (pre- and post-). Therefore, I have a total of 52 scans. I have included three factors in the model: SUBJECT, GROUP and CONDITION. SUBJECT: independence-yes, variance-equal GROUP: independence-yes, variance-unequal CONDITION: independence-no, variance-equal I specified three main effects (one for each factor) and the interaction between GROUP and CONDITION. I specified all Scans (52), therefore the Factor Matrix (52 x 4) was defined as 1 1 1 1 1 1 1 2 1 2 1 1 1 2 1 2 1 3 1 1 1 3 1 2 1 4 1 1 1 4 1 2 1 5 2 1 1 5 2 2 ... 1 23 3 1 1 23 3 2 1 24 3 1 1 24 3 2 1 25 3 1 1 25 3 2 1 26 3 1 1 26 3 2 I also tried to define the first column as the number of observation, i.e. 1 2 3 4 5 6 ... 52 but still does not work. Thank you, Bedda On Tue, Sep 6, 2011 at 6:52 PM, MCLAREN, Donald <[log in to unmask]>wrote: > I'm not sure when this change happened, but I know there are several > posts from me and others where the FlexFact model was specified as: > column 1: 1 to N > column 2: factor 1 levels > column 3: factor 2 levels > column 4: factor 4 levels > > In the current release, the first column should be set to 1s. > > Otherwise, the covariances are not estimated. > > If anyone thinks this is incorrect, please correct me. > > 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 > 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. >