Uhhh, that gives you end to end measurements. I don't think this gives
you meaningful hard number. Depends what you want to do. If you want to
go with the "Let's take end-to-end and add 20%" approach, that's fine.
However, I know a couple of big blunders recently happening with that.
If you're looking at this from a commercial point of view I would look
(measurement based) or
For both approaches there are papers floating about.