Hi guys,
Wondering how I can specify a second level covariate (IQ), when I have a missing value.
And then, how would I define the contrast for second-level analyses?

I read somewhere you can remove with a 0, but for a continuous variable this doesn't make sense (say for example I'm trying to control for Beck Depression Inventory score, and many controls have a score of 0). Will Conn know I'm referring to IQ if my covariate title is named IQ and remove the person with a 0? What if I'm entering a covariate for a behavioral scale (BDI, etc) and someone has a score of zero?

Additionally, I don't want to remove/exclude a whole participant from an analysis, as explained in the Nov. 6th 2014 response from Prady Umma to Karolina , where she explains how to make an 'Exclude_subjects" covariate with 1s and 0s.

Thanks so much guys for any help you may be able to provide!

All the best,

Fred