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) and the columns indicate the factors (2, one for group and one for condition, subject is automatically modelled). </div> <div>So for a subject in group 2 with scans for all four conditions you would need:</div><div>[2 1<br>2 2 <br>2 3</div><div>2 4]</div><div>Make sure your scans are entered in the right order!</div><div><br></div><div>Also, main effect for subjects doesn't need to be specified, this is done automatically (this is because you chose 'Subjects' at the 'Specify Subjects or all Scans & Factors').</div> <div><br></div><div>Good luck, </div><div><br></div><div>Pieter</div><div><br></div><div><br><div class="gmail_quote">On Mon, Feb 28, 2011 at 3:14 PM, Jeffrey West <span dir="ltr"><<a href="mailto:[log in to unmask]">[log in to unmask]</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> <div style="margin:4px 4px 1px;font:10pt Tahoma"> <div>Hello.</div> <div> </div> <div>I have question relating to setting up a flexible factorial model with 2 groups, each group has 4 conditions.</div> <div> </div> <div>I have 3 factors: 1 = subject (independent, variance equal), 2 = group (independent, variance not equal), 3 = condition (not independent, variance equal)</div> <div> </div> <div>For the subject level, I entered in 20 subjects, for each subject, I entered in the the 4 scans: con_image 1,2,3,4. For conditions, I entered 1 2 3 4. Once all 20 subjects were completed, I entered 3 main effects, and interaction: main effect: 1, main effect: 2, main effect: 3, interaction: 2 3. </div> <div> </div> <div>The model did not run and I got the following error message:</div> <div> </div> <div><strong>Running job #2<br>-----------------------------------------------------------------------<br>Running 'Factorial design specification'<br>Failed 'Factorial design specification'<br>Index exceeds matrix dimensions.<br> In file "C:\Documents and Settings\JWest\Desktop\spm8\config\spm_run_factorial_design.m" (v3067), function "spm_run_factorial_design" at line 482.</strong></div> <div> </div> <div><strong>The following modules did not run:<br>Failed: Factorial design specification</strong></div> <div><strong></strong> </div> <div>I feel like the error is in the subject level: either the scan or the conditions. I do not feel like the conditions step is correct. Can anyone please explain what I did wrong setting up my model. </div> <div> </div> <div>Thank you for any suggestions.</div> <div> </div> <div>Jef</div> <div> </div> <div> </div> <div>Jeffrey West, M.A.<br>Research Analyst<br>Maryland Psychiatric Research Center<br>Baltimore, Maryland 21228-0247<br>Phone: <a href="tel:410-402-6018" target="_blank">410-402-6018</a><br>email: <a href="mailto:[log in to unmask]" target="_blank">[log in to unmask]</a> </div> <div> </div> <div> </div></div> </blockquote></div><br></div> --bcaec51a894a8f7f93049d601f97--