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Dear SPMers, Using GLM, statistical model (e.g. box-car) can be fit to the averaged time series ROI data of each subject and the percent of variance accounted for (PVA) can be calculated. The PVA is the same value as the R2 value obtained from correlation analyses between the model and actual time series data. I'm wondering if any one can instruct me how to obtain the PVA or R2 value directly or indirectly from SPM5. Thanks! Sherry _________________________________________________________________ Test your celebrity IQ. Play Red Carpet Reveal and earn great prizes! http://club.live.com/red_carpet_reveal.aspx?icid=redcarpet_hotmailtextlink2