pattern in the immediate past is as close as it gets to predicting immediate futures. 10+ years backtesting is irrelevent for correlation. in this case. one always needs to balance the length of historical data, and the relevancy of the data.
fin 101 teaches you that higher frequency - think of intraday intervals - helps to dramatically improve the esimation of 2nd moment, while does nothing for 1st moment.
to trade and time the money across multiple asset classes, one needs to understand macro/monetary policy. a back office quant analysis / TA / blind diversification will not work in the current environment.
nothing will ever be 100% in trading. u need to trust your intuition and your analysis. then there is a lot of art component. risk management lets ur true talent shine through cloud over time.
just my 2c.
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