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TJ,
> has the market structure really changed that much over time? no...
>
> are not much of the structural changes mostly minor, scaling related?
yes...
>
> and as such, are short data histories (<3 yrs) generally a bad idea?
yes...
>
> ok, then are long trade histories (20+ yrs) essential to properly define
the model, insure its profitability in the future, and arm the trader with
unemotional confidence? yes...
>
> tell me why i'm wrong...
I can't at least not without making statements that I can't support. Tell
me why you're right.
Regards,
Mike
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