Hi all,
I have a two questions about performing a regional homogeneity analysis.
1. Is it best to smooth before or after ReHo? I've found examples of smoothing first (Wu 2008; Yao 2008 ) and, alternatively, ReHo first (Liu 2010; Shukla 2010).
2. I have found some papers in which individual KCC maps were normalized via dividing by a mean KCC value. But I'm not sure whether to divide each individual map by it's own mean KCC value (Wu 2008; Yao 2008), the mean KCC of all subjects, or the mean KCC of all subjects within that group (Wu 2007). Which might be the ideal route to go? Or, would it be terrible to not perform this step? I intend to compare ReHo values between multiple groups.
Thank you!
Thomas