Hi - it doesn't matter what numbers go in that row, for this purpose. Cheers. On 13 Jan 2011, at 11:29, Victor Saenger wrote: > Thank you for your quick response. I encountered another problem. as Im using a paired test for resting state analysis, the contrast file has a /RequiredEffect row that its value varies depending on the number of subjects. Is this value important? If it is, how can I calculate it? > Thanks again! > Victor Saenger > --------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------