Lol so tell me how a stock price can be higher than its past high if that higher price does not exist in the sample? It would register as a probability of 0 in your world.
Yes quants use price data, but they're conducting analysis on returns not on levels. Stock prices are nonstationary.
OMG have you ever heard of a measured move? Do you even chart at all? How are you going to calculate the probability of a return if you can't calculate the probability of a price level? Quants take into account trend so they are quite capable of projecting into the future...they aren't just chasing probabilities that price can move 2% in the next 3 days based on the last x days blindly... lol.
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