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Hi Eddy, Not exactly. You need to do: fslmaths L1_group_1 -Tmean -mul <#subjects in group 1> L1_sum_1 fslmaths L1_group_2 -Tmean -mul <#subjects in group 2> L1_sum_2 fslmaths L1_group_3 -Tmean -mul <#subjects in group 3> L1_sum_3 fslmaths L1_sum_1 -add L1_sum_2 -add L1_sum_3 -div <#subject in total> L1_average Cheers, Saad. On 17 Mar 2009, at 12:50, Eddy D.L. wrote: > Hi Saad, > I have a question: > After tbss_non_FA process, I have L1_group_1, L2_group_2, L3_group_3 > (if I > split in 3 group the total patients) ..so I will have 3 L1,3 L2 e > 3L3; can I > do easy average of this to obtain L1_average? > > Similar to: fslmaths L1_group_1 -add L2_group_2 -add L3_group_3 -div 3 > L1_average > > It's correct? > > cheers, > > Eddy > Saad Jbabdi Oxford University FMRIB Centre JR Hospital, Headington, OX3 9DU, UK +44 (0) 1865 222545 (fax 717) www.fmrib.ox.ac.uk/~saad