Standard Deviation Complete Guide
Standard Deviation
What is Standard Deviation?
Standard Deviation is a statistical measurement that quantifies the dispersion of price data relative to its Simple Moving Average (SMA). In technical analysis, it serves as a primary gauge of market volatility. While the mathematical concept of standard deviation has existed for centuries, its application in modern trading was popularized by John Bollinger, who used it as the foundational calculation for Bollinger Bands. The indicator measures the 'spread' of prices: when price candles are far from the mean, the standard deviation is high, indicating high volatility. Conversely, when prices cluster near the mean, the standard deviation is low, indicating a stable or consolidating market. The default parameter is typically set to 20 periods. Practically, traders use this indicator to identify periods of extreme market exhaustion or to anticipate upcoming breakouts. A very high reading often suggests that the current price move is unsustainable and a return to the mean (mean reversion) is likely. Extremely low readings indicate a 'volatility squeeze,' which often precedes a significant directional breakout. It is crucial to remember that Standard Deviation is a non-directional indicator; it measures the magnitude of movement, not the trend direction.
Signal Types
Volatility Squeeze (Low SD)
When the indicator reaches multi-period lows, it suggests the market is in a period of consolidation. This often precedes a sharp, high-momentum breakout in either direction.
Volatility Peak (High SD)
An exceptionally high reading indicates extreme price dispersion. This often signals trend exhaustion or a 'climax' move, suggesting a potential reversal or period of sideways trading.
Mean Reversion Setup
When Standard Deviation spikes alongside a price move away from the average, it identifies an overextended market, providing a signal to look for entries back toward the moving average.
Related Indicators
FAQ
Does Standard Deviation predict if the price will go up or down?
No. Standard Deviation only measures the intensity of price movement and volatility. It does not provide information about the direction of the trend.
What is the difference between Standard Deviation and ATR?
Standard Deviation measures price dispersion relative to a mean (SMA), while ATR measures volatility based on the high-low range of price bars. SD is more focused on consistency relative to an average.
Why is the 20-period setting commonly used?
The 20-period setting is the industry standard because it aligns with the default settings of Bollinger Bands and represents approximately one month of trading days in traditional markets.
Parts of this page (FAQ, introductions) are AI-assisted. Core data and statistics are algorithmically computed. All pattern definitions are human-reviewed.
Aviso legal: Esta página se basa en datos de mercado públicos y análisis técnico algorítmico. No constituye asesoramiento de inversión.
Data source: EODHD · © 2026 KlineVision AI