Crabel identified that when the market experiences an unusually tight trading range (the narrowest in 4 or 7 days), it is often a precursor to a massive spike in volatility and a sharp price move.
It sounds like you're interested in the work of , specifically his influential book, Day Trading with Short Term Price Patterns and Opening Range Breakout .
This text is often considered a "holy grail" for and scalpers . Published in 1990, it popularized several core concepts that remain staples in the trading world today:
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