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I'd have thought that it's not going to be particulary useful for comparing different products, as it is dependent on your own deposits and withdrawals.
It may be useful if you are planning on putting in and taking out money all the time, and will do that irrespective of what you are investing in.
I don't really think it has a huge amount of utility in assessing the performance of a single products that you have invested in - simple returns just make way more sense.
Even of you're doing lots on inflows and outflows, you could just do a simple (or discounted) return in each one separately.
cjr
NotThamesWater
Deep dive here if you really want to get to grips with it.