Do you mean the timeseries output by that regression? They are not regressors - they are the GLM output - the fitted parameters. They could have any scale, depending on your data and your model. Steve. On 26 Apr 2013, at 05:15, Marco Loggia <[log in to unmask]> wrote: > Thanks Steve, > > I guess what raised the red flag is that the regressor values I have usually seen in the past were from ~ -10 to ~10. Any comments on these regressors, which reach 40s and 50s? > > Best, > > Marco > --------------------------------------------------------------------------- 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) 2176 [log in to unmask] http://www.fmrib.ox.ac.uk/~steve ---------------------------------------------------------------------------