In Monday trading, a poorly-followed $1,000+ stock was one of the top 100 bullish surprises. Graham Holdings Company (GHC) gained 3.0% on the day, with a standard deviation of 2.34, indicating the share price moved 2.34 standard deviations relative to its historical volatility.
The Barchart Help section for Standard Deviation states: “According to the normal distribution bell curve, a stock will show a move of less than one standard deviation (plus or minus) about two-thirds of the time, a move of less than two standard deviations 95% of the time, and a move of less than three standard deviations 99% of the time.”
