the calculation is quite easy:
d = ----------------
Try the attached tool or use the imcalc function.
Christian Gaser, Ph.D.
Assistant Professor of Computational Neuroscience
Department of Psychiatry
Friedrich-Schiller-University of Jena
Jahnstrasse 3, D-07743 Jena, Germany
Tel: ++49-3641-934752 Fax: ++49-3641-934755
e-mail: [log in to unmask]
On Fri, 1 May 2009 18:23:14 +0800, zhu zhu <[log in to unmask]> wrote:
>My reviewer asked me to report Cohen's d in a VBM analysis. It seems it is
>easy caculate effect size in ROI analysis, that I can caculate effect size
>in SPSS for ROI analysis. However, how can I caculate it in SPM contrast? If
>this is possible, is it the average effect size across a activation cluster
>will be reported in SPM? Thank you very much!