We've been discussing lately about if the enrichment score (ES), not the normalized (NES), can have values higher that 1 and lower than -1. I've done several tests using fgsea (R, package) and I never get an ES out of the range of the range of [1,-1].
Is it possible to get an ES outside this range? If this is possible, when can an ES be outside this range.
Thanks all for your time.