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Hi Rachel

It is the residuals which need to be independent and identically (normal) distributed, not the covariates of interst. 

Hope this helps

Torben




Torben Ellegaard Lund
Assistant Professor, PhD
The Danish National Research Foundation's Center for Functionally Integrative Neuroscience (CFIN)
Aarhus University
Aarhus University Hospital
Building 30
Noerrebrogade
8000 Aarhus C
Denmark
Phone: +4589494380
Fax: +4589494400
http://www.cfin.au.dk
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Den 20/04/2008 kl. 05.32 skrev Rachel Grossman:

Hi SPM community,

 

I have a question concerning the distribution of covariates of interest. How does SPM deal with covariates of interest that are not normally distributed? For instance if the values are skewed toward the minimum and the maximum limits?

 

Thanks for your advice,

Rachel


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