Dear Alfonso,

Thanks a lot indeed for your reply, as always, very helpfull.

Following on that topic another quite tricky question (at least for me now, but believe will be useful for many).

When the super handy option of "Describe Methods" produces the paragraph of "Describe Quality Control steps" one reads that "(...) and excluding participants whose QC metrics were extreme outliers (values more than three interquartile ranges beyond the first or third quartile)".

My question is: are they actually automatically exluded? If YES, why do they still appear in my Secon dlevel covariates?

Thanks a lot for any input!

All best!

Renzo