There's pure ARP where you have the same instrument in multiple places and that is just a pure speed race, micro structure race. And then you have what's more like stat ARP where things are 80% correlated, 70% correlated, sometimes lower 60%, 50%. And maybe at some point to get a clean signal, what you have to do in age 50 is combine these things in a way that reduce noise and filters come into play or you start using linear regression methods with penalization. So penalized regressions are state of the art.

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