A significant positive T/Z statistic means that as your numeric scale goes up, the activity also goes up. As the numeric scale goes down, the activity also goes down. A signficant negative T/Z statistic means that as your numeric scale goes up, the activity goes down. As the numeric scale goes down, the activity goes up. For conversion of T-statistics to R, search for Conversion of Common Test *Statistics* to *r* and d Values *Statistic*<http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CDEQFjAB&url=http%3A%2F%2Fwww.soph.uab.edu%2FStatgenetics%2FPeople%2FMBeasley%2FCourses%2FEffectSizeConversion.pdf&ei=tOAyT7r-DYT20gHD19XcBw&usg=AFQjCNGdbmI3w-4CrQNKr1x0ILh2hqlL1Q&sig2=l0d34HGbb5OE4sy_fk1XKg> 95% CI: mean+/-1.96*SEM SEM is computed as standard deviation divided by the square root of N, where N is the number of subjects. T=con/SEM. Putting these together, SEM=conimage/T-statistic. 95% CI would be conimage-1.96*conimage/T-statistic to conimage+1.96*conimage/T-statistic. Best Regards, Donald McLaren ================= D.G. McLaren, Ph.D. Postdoctoral Research Fellow, GRECC, Bedford VA Research Fellow, Department of Neurology, Massachusetts General Hospital and Harvard Medical School Office: (773) 406-2464 ===================== This e-mail contains CONFIDENTIAL INFORMATION which may contain PROTECTED HEALTHCARE INFORMATION and may also be LEGALLY PRIVILEGED and which is intended only for the use of the individual or entity named above. If the reader of the e-mail is not the intended recipient or the employee or agent responsible for delivering it to the intended recipient, you are hereby notified that you are in possession of confidential and privileged information. Any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited and may be unlawful. If you have received this e-mail unintentionally, please immediately notify the sender via telephone at (773) 406-2464 or email. On Wed, Feb 8, 2012 at 3:47 PM, Miguel Ferreira <[log in to unmask]>wrote: > Dear SPMers > > I've performed a multiple regression study in SPM8 to study the influence > 3 numeric scales on fMRI activation pattern. I have positive and negative > correlations, and I would like to know what can I conclude from the T and Z > statistic of activated voxels. Is it possible to calculate the r-squared > and the 95% CI for each voxel in SPM? > > Thanks in advance, > Miguel. >