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eheheh, yes, sure :) Thank you again! elisa 2013/11/8 Anderson M. Winkler <[log in to unmask]> > oops! the file should look like this (as described): > > > /NumWaves 4 > /NumContrasts 2 > /Matrix > 0 1 0 0 > 0 -1 0 0 > > > > On 8 November 2013 12:56, Anderson M. Winkler <[log in to unmask]>wrote: > >> Hi Elisa, >> >> If anxiety is the 2nd column, and it's the one you're interested in, the >> contrasts should be: >> >> 0 1 0 0 >> 0 -1 0 0 >> >> You also need to change the /NumContrasts to 2, instead of 3. The >> /PPheights isn't used and you can delete this line. The file should then >> look like: >> >> /NumWaves 4 >> /NumContrasts 2 >> >> /Matrix >> 1 0 0 >> -1 0 0 >> >> Alternatively, use the command Glm (or Glm_gui in a Mac) to generate >> these files with visual feedback and error checking. >> >> All the best, >> >> Anderson >> >> >> >> >> On 7 November 2013 14:21, elisa veronese <[log in to unmask]>wrote: >> >>> >>> >>> -- >>> Elisa Veronese - PhD >>> >>> * Research Unit on Brain Imaging and Neuropsychology (RUBIN)* >>> >>> >>> >>> >>> >>> >>> >>> >>> * Inter-University Center for Behavioral Neurosciences (ICBN) University >>> of Udine and University of Verona, Italy ICBN >>> Website: http://icbn.uniud.it/tiki-index.php >>> <http://icbn.uniud.it/tiki-index.php> Dear FSL experts, I am running a >>> TBSS analysis on a group of healthy subjects. I have their FA images, along >>> with their age, sex, and anxiety scale. Age and sex are covariate of no >>> interest, and I want to check if the anxiety scale has a correlation with >>> FA. My design.mat file is something like this /NumWaves 4/NumPoints >>> 21/PPheights 1 1/Matrix1 -16,1428571428571 2,74238095238096 >>> -0,333333333333333 1 -13,1428571428571 1,99238095238096 -0,3333333333333331 >>> -11,1428571428571 3,84238095238096 -0,333333333333333 1 40,8571428571429 >>> -1,40761904761904 -0,333333333333333 ...where the first column is the group >>> (1=healthy subjects, they are 21), the second column is the demeaned >>> anxiety scale, the third column is the demeaned age, and the fourth column >>> is the demeaned sex. My problem is in the definition of NumWaves in the >>> design.con file. Is it correct to write it like this? And what about the >>> NumContrasts? /NumWaves 4/NumContrasts 3/PPheights 1 1/Matrix1 0 0 -1 0 0 >>> Thank you in advance, elisa* >>> >> >> > -- Elisa Veronese - PhD *Research Unit on Brain Imaging and Neuropsychology (RUBIN)* *Inter-University Center for Behavioral Neurosciences (ICBN)University of Udine and University of Verona, ItalyICBN Website: http://icbn.uniud.it/tiki-index.php <http://icbn.uniud.it/tiki-index.php>*