...and c) There is no way to PREDICT market movement since everything is priced in as of that point in time (i.e. Efficient Market Theory)
"...No way to PREDICT..."
And yet we use Normal and logNormal distributions, EACH AND EVERY DAY.
We DEPEND UPON "IID" -- Independent & Identically-Distributed -- EACH AND EVERY DAY.
BROWNIAN MOTION and WIENER PROCESS and the whole damn family of Levy & Co.
But ("Uh-ohhhhhhhh!"), anytime they get used in a stochastic process, there is a component (call it "TREND" if you need help), that carries us from one snap-shot instance to the next. But learning about trends, and violating flippant use of "random" gets messy quickly! Mr.s Durbin & Watson come to the fore, "time-series decomposition" gets learned ("or not!"), and people who perhaps shouldn't be trading via TT-"lessons" get glassy-eyed and turn away -- not realizing how their ignorance will cost them money. TT has just given them license to ignore mkt trends, ignore news, ignore the host of empirical tools cuz Hey[!], It's All Random!!
Big ol' FAIL on TT every time they do it. Reversion-to-Mean trading DEPENDS on having a statistical expectation for the MEAN -- and REALITY recognizes that that mean changes over time. (Unless, of course, you drink a LOT of the KoolAid...)
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