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Hi all,

I am doing an analysis and generating the FSGD. I understand sex and race are 
classes in this context, but something I was also hoping to regress out is the 
effects of scanner/sequences. We have a large participant size, so we have 
around 10+ scanner/sequences, which makes for a large amount of classes 
combinations, with some having just 1 (if not zero) fitting into a class.

Would you proceed with this nonetheless? If not, should scanner/sequence be 
something that we consider? Should we find some other way to adjust site (I 
don't think we can z-score...). Or can we consider site/scanner as a continuous 
variable

Victor Zeng
Beth Israel Deaconess Medical Center
Keshavan Lab
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