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Hi, Yes, just multiply the PEs by the peak-peak height (which you can find from the design.mat file). On 22 Apr 2009, at 11:56, Aryan Singh wrote: > Hi FSLers, > I have two PE values , one from a 4s duration stimulus and another > from an 8s duration stimulus. Instead of doing a t test to test for > difference between the intensities i just want to look at the PE > values for comparison. Should i have to multiply each PE value with > the respective Peak to peak height of its convolved model in order > to see if the 8s PE is higher in value to the 4s PE? Is this > multiplication/rescaling the same as rescaling the 4s and 8s > regressors to the same peak to peak height after convolution ? Yes. Cheers. > i.e first question is basically rescaling PE after regression and > the latter question is rescaling before regression. I hope i made > sense. > Thank you! > Aryan > > --------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------