I would like to be able to use Rating("") in custom universe. I hope to do the following:
1. Create a custom universe with Rating("Ranking System A")>90. Then create a custom series based on this custom universe.
2. Create a custom universe with Rating ("Ranking System B")>90. Then create a custom series based on this custom universe.
3. Create Ranking System C which is a combo of Ranking System A and Ranking System B. In Ranking System C, create a node that references the performance of the above 2 custom series. The point is to use it as a way to create a ranking system in which you can dynamically adjust factor weights based on the recent performance of the underlying factors.