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I guess you would want to scale them to have same final PPheight if you want to compare peak values via the PEs - that should be easy using the info in the header of the design.mat file. Cheers. On 16 Mar 2009, at 18:24, Vishwadeep Ahluwalia wrote: > Hi , > This is somewhat related to my previous question. I want to compare > the same > 16s/32s on/off block fMRI data with 3 different models. Model1: > Block-On=16s > , Model 2: Block-On=10s and Model3: Block-On=4s. Each convolved with > Double > gamma Hrf. I want to compare the PE values across these 3 models in > different ROIs. The PP heights of these three models are different. > Would i > need to rescale each regressor to the same height? > I would run 3 separate analysis on the same data, however is there a > faster > way i can do this? > Thanks! > -Vish > --------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------