Sorry, I am not sure if I fully understand this. Would you mind double checking my design/contrast matrix?
I would like to look at correlations between FA and one clinical measure.
My design matrix is as followed:
/NumWaves 2
/NumPoints 30
/PPheights 1.000000e+00 6.100000e+01
/Matrix
1.000000e+00 -1.351351e+01
1.000000e+00 -1.251351e+01
1.000000e+00 3.486486e+00
...
1.000000e+00 2.148649e+01
1.000000e+00 -1.351351e+01
My contrast file is as followed:
/ContrastName1 poscorr
/ContrastName2 negcorr
/NumWaves 2
/NumContrasts 2
/PPheights 6.100000e+01 6.100000e+01
/RequiredEffect 3.702 3.702
/Matrix
0.000000e+00 1.000000e+00
0.000000e+00 -1.000000e+00
When I run the following command:
randomise -i all_FA_skeletonised -o tbss_corr -m tbss_FA_mask -d corr.mat corr.con -n 500 --T2 -V -D
I got the following warning:
Warning: You have demeaned your data, but at least one design column has non-zero mean.
This warning is most likely due to numerical precision in demeaning of my clinical measure. Can it be ignored?
Thank you all very much.
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