Dear SPM
I am conducting a second level analysis linear regression trying to correlate clinical markers of disability with contrast maps in fMRI data.
I have entered my contrast images and the appropriate covariates (8 each) as asked for. I entered 'no grand mean scaling' and 'omit global normalistion'. I am not sure what to type for threshold masking and type omit.
After estimation, the design matrix has two columns, the first has the mean corrected covariates and the second is blank. What do I enter to look for positive or negative correlations. Is it just [1] and [-1]?
Thanks
Ahmed Toosy
|