Dear Xin,
If you know the degrees of freedom (d.o.f.), you can convert z to t.
The greater the number of d.o.f., the closer the two are.
In fact the SPM output tables give you both anyway...
All the best,
-----------------------------
Alexander Hammers, MD PhD
Chair in Functional Neuroimaging
Neurodis Foundation
http://www.fondation-neurodis.org/
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]
---------------------------------
Other affiliations:
Visiting Reader; Honorary Consultant Neurologist
Division of Neuroscience and Mental Health, Faculty of Medicine
Imperial College London, UK
---------------------------------
Honorary Reader in Neurology; Honorary Consultant Neurologist
Department of Clinical and Experimental Epilepsy
National Hospital for Neurology and Neurosurgery/ Institute of
Neurology, University College London, UK
On 18 Oct 2010, at 12:53, Xin Di wrote:
> Dear experts,
>
> I am going to estimate effect size of fMRI studies from cluster's
> peak t score. However, I find that many studies reported z score
> rather than t. Is there any formula of function to convert z score
> back to t score? Thank you very much!
>
> Best regards,
>
> --
> Xin Di, PhD
> Department of psychology
> Sun Yat-Sen University
> Guangzhou, 510275
> P. R. China
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