Dear SPMers
I have a question about regression analysis in SPM2.
I have a plan to study SPECT images from traumatic brain injury patients
(n=14) and age, sex - matched normal control (n=14).
I want to see
1) the comparison between patient group and normal control, and
2) the correlation between regrional cerebral perfusion and cognitive function
in patient group. (becase I have results of cognitive task from only patient
group.)
To do regression analysis (by using 'single subj: covariates only' option) in
SPM2, How many subject's number do I need?
In my case, 'n=14' is possible?
I want to know the minimum number of subject needed in SPM regression
analysis.
Thanks in advance.
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