Regarding custom design matrices, does the --X flag require a design matrix in matlab format? If so, can I simply create it in a text editor and name it with the suffix ".mat"? Also, if I use the --X to specify a design matrix, am I still supposed to specify the fsgd file? Thanks, - Jerry
On Wed, Apr 9, 2008 at 4:58 PM, Jerry Yeou-Wei Chen jyw.chen@utoronto.ca wrote:
Great! Thanks!
- Jerry
On Wed, Apr 9, 2008 at 3:50 PM, Doug Greve greve@nmr.mgh.harvard.edu wrote:
You can pass custom design and contrast matrices to mri_glmfit, so you can pass the same matrices to mri_glmfit that you would use with spm. Alternatively, you can set up an fsgd file with a 3rd continuous variable that is the produce of the first two.
doug
Jerry Yeou-Wei Chen wrote:
Hello, I would like to know how to examine an interaction between continuous variables. In SPM, my understanding is that a new interaction regressor, comprised of the product of the two continuous variables of interest, can be coded and entered into the model. Would this be appropriate for CTA group analysis in FreeSurfer? Is there any difference if I use the old command line method or the QDEC GUI? Thanks,
- Jerry
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