Hi - I guess this is mostly correct, but probably the handling of mean modelling / demeaning may be wrong - see Jeanette Mumford's web page on these issues.
Cheers, Steve.


On 27 Dec 2012, at 10:04, Ai Qing wrote:

Dear FSL experts:

     I colloected 56 patients with cognitive impairment consecutively. I want to analyses these data using TBSS, one group. All these patients had scores of cognitive scale. I want to observe the relationship between FA and the degree of cognitive impairment.

     I choose score of cognitive scale as main EVs, and age, sex, education as co-variates. The following are my design.mat and design.con files.

design.mat:

/NumWaves 4
/NumPoints 55
/PPheights 2.600000e+01 2.000000e+00 7.900000e+01 5.000000e+00

/Matrix
2.200000e+01 2.000000e+00 6.400000e+01 1.000000e+00
2.300000e+01 2.000000e+00 6.800000e+01 2.000000e+00
1.500000e+01 2.000000e+00 6.100000e+01 3.000000e+00
2.600000e+01 1.000000e+00 7.400000e+01 1.000000e+00
.............


design.con:

/ContrastName1 ev1_pos
/ContrastName2 ev1_neg
/NumWaves 4
/NumContrasts 2
/PPheights 1.630884e+01 1.630884e+01
/RequiredEffect 2.339 2.339

/Matrix
1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00
-1.000000e+00 0.000000e+00 0.000000e+00 0.000000e+00

I don not know whether the above design is correct.

Thanks!!



---------------------------------------------------------------------------
Stephen M. Smith, Professor of Biomedical Engineering
Associate Director,  Oxford University FMRIB Centre

FMRIB, JR Hospital, Headington, Oxford  OX3 9DU, UK
+44 (0) 1865 222726  (fax 222717)
[log in to unmask]    http://www.fmrib.ox.ac.uk/~steve
---------------------------------------------------------------------------