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Dear all,
I was asked to provide a power calculation of my group comparison
results on cortical thickness, so I extracted all clusters with significance in
CT into SPSS. but I found the cluster value of CT is not significant in SPSS
based on group comparison. so I got a very small effect size although the
original ROI was generated by a initial threshold of p < 0.001, and corrected
by monte-carlo p < 0.05, two sided.
Is this possible? how can I resolve it?
best,
Yali
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