Hello,
You get more response if you give a bit of context.
Not everybody is working in the same sector / area as yourself.
I had to look up what it was : "Slope Index of Inequality" (maybe it's because I'm not American, maybe it's widely known in the US?).
And hierarchical regression can also mean lots of things : it can be about the way variables enter into the model (respecting hierarchy or not), it can be about multi-level modelling, it can be other things.
Can you give a bit more context?
Thanks,
Koen