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The difference between that and what TMF does is to look at a mechanical investing technique which makes logical sense, then back testing to see if it is valid or not.

Just so you understand, that statement is not true. Whether the premise is logical or not has nothing to do with the effects of datamining at all. I try to explain that here. TMF's datamining is no different than “regular” datamining.

There is also a strong argument against whether the F4 is logical to begin with

I agree that the F4 "sounds" very good. But IMO, it is all flash and no substance.
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