http://fsl.fmrib.ox.ac.uk/fsl/fslwiki/Randomise/Theory On 6 May 2014, at 15:33, Vera Steinheuser <[log in to unmask]> wrote: > Hello everybody, > > I have a sample of 100 participants and I want to check for correlations with some cognitive measures and FA. > > I just randomise with 500 permutations. Do you think that number is enough, or do I have to put it up to 5000 permutations? > > Thanks, > > Vera --------------------------------------------------------------------------- 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 --------------------------------------------------------------------------- Stop the cultural destruction of Tibet