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Dear all, Thanks for your kind suggestion. To Matthew, setting it to 100 doesn't work too. I thought if we choose scaling fro Raw data from the previous step, we are kind of prompted to set the scale grant mean to '0' in the subsequent step. Isn't it? Any other thoughts? Best, Fiona Quoting Matthew Brett <[log in to unmask]>: > Hi, > > On Mon, Oct 24, 2016 at 5:35 AM, Jacek Matuszewski > <[log in to unmask]> wrote: > > Dear Fiona, > > > > If I'm not mistaken this is the moment where you have to select your ROI > > files - .mat files with spheres / anatomical masks that you want the data > > extracted for. Have you specified those in your steps? > > Many thanks for the reply - but I think that Fiona will have selected > the ROIs at her third step - there may be something confusing going on > with the grand mean set to zero - see below. > > > W dniu 2016-10-21 20:51, FAN Sin Ying napisał(a): > >> > >> Dear all, > >> > >> I was trying to use marsbar to work out the percent signal change for > ROIs > >> drawn > >> in our lab. The following were my steps involved: > >> > >> Design -> Set design from file --> SPM.mat was selected > >> Data -> Extract ROI (full options) > >> ROIs selected from files > >> Yes to 'Use SPM design' > >> 'Images from' -> 'SPM design' was chosen > >> 'Scaling from' -> 'Raw data' was chosen > >> 'Scale grant mean to' -> was set to 0 > >> Results --> 'Estimate results' > >> > >> Then a window popped up and asked me to 'select ROI data' again. I don't > >> know > >> what files I am supposed to choose. Anyone has any ideas? > > That is strange. I wonder whether marsbar is getting confused with > the grand mean set to 0. I bet that causes some divide by 0 error or > simlar, which makes the data all be zero. Try setting the mean to be > 100 - does it fix the problem? > > Cheers, > > Matthew > > ------------------------------------------------- This e-mail is sent by CUHK WebMail http://webmail.cuhk.edu.hk