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> Dear Gonzalo, > > > How many pairs of scans do you have (pairs of patients, pairs of > controls)? You may simply not have the statistical power to detect > anything. > > All the best, > > Alexander > > > --------------------------------- > Alexander Hammers, MD PhD > > > > NEW Affiliation: > Chair in Functional Neuroimaging > Fondation Neurodis > http://www.fondation-neurodis.org/ > > NEW Postal Address: > CERMEP – Imagerie du Vivant > Hôpital Neurologique Pierre Wertheimer > 59 Boulevard Pinel > 69003 Lyon > France > > Telephone +33-(0)4-72 68 86 34 > Fax +33-(0)4-72 68 86 10 > Email > [log in to unmask];[log in to unmask] > Web (London lab) > > http://www1.imperial.ac.uk/medicine/people/alexander.hammers.html > http://www.csc.mrc.ac.uk/Research/Groups/ECN/Epilepsy/ > --------------------------------- > Other affiliations: > > Visiting Reader; Honorary Consultant Neurologist > Division of Neuroscience and Mental Health, Faculty of Medicine > Imperial College London > > Room 243, Cyclotron Building > Hammersmith Hospital, DuCane Road, London W12 0NN > > and > > Honorary Reader in Neurology; Honorary Consultant Neurologist > Department of Clinical and Experimental Epilepsy > National Hospital for Neurology and Neurosurgery/ Institute of Neurology, > UCL > 33 Queen Square, London WC1N 3BG > > On 6 Oct 2009, at 02:01, Gonzalo Rojas wrote: > >> Hi: >> >> I am working with a paired T-test study to compare two PET >> aquisitions of one patient... In the "Estimate" process I got the error >> "Please check your data. There are no significant voxels"... I used the >> default values of the Paired t-test design... >> >> Sincerely, >> >> >> -- >> Gonzalo Rojas Costa >> Department of Radiology >> Las Condes Clinic >> Lo Fontecilla 441, Las Condes, Santiago, Chile. >> Tel: 56-2-2105170 >> Cel: 56-9-97771785 >> www.clc.cl > >37_6Oct200908:41:[log in to unmask] |