Yes. Some code was posted here that invokes the work of Jack van Horn to produce an image of power: http://web.njit.edu/~jrs3/matlabfiles/ Regards - MFG > -----Original Message----- > From: SPM (Statistical Parametric Mapping) > [mailto:[log in to unmask]] On Behalf Of Susanna Carmona > Sent: Wednesday, March 30, 2005 6:20 AM > To: [log in to unmask] > Subject: [SPM] Power analysis > > Hi everyone. > I need to run a power analysis to calculate the sample size > of a project. > This project involves three groups: two patient groups and > one control. Is there any SPM toolbox that can help me to > calculate the necessary sample size given data from previous studies? > Thanks > Susanna >