Bollinger Bands: Construction, Volatility Signals, and Trading Setups
Summary
Bollinger Bands pair a simple moving average with upper and lower envelopes set at a chosen number of standard deviations from that average. The guide explains how look-back periods and deviation settings shape the bands, and how band width can track changing volatility. Narrow bands mark a squeeze, which may precede a large move but do not indicate its direction. The article also discusses reversals after band breaches, double tops and bottoms, and strategies that use the average or opposite band as trade references.
Band touches can suggest stretched conditions, but the article cautions against treating them as automatic buy or sell signals. It gives chart examples, including a lower-band breach followed by a rebound, but does not provide systematic tests, transaction costs, or evidence of reliable profitability. Settings may need adjustment across assets and timeframes, and the indicator can be less useful in strong trends or unpredictable markets. It recommends combining the bands with other analysis and risk controls.
Key ideas
- Bollinger Bands place upper and lower volatility envelopes around a simple moving average.
- Band width expands and contracts with volatility, while a squeeze signals compression without predicting the breakout direction.
- The guide describes reversal, double top and bottom, and band-to-band trading setups.
- Band breaches and touches are potential inputs to analysis, not standalone trading instructions.
- Effectiveness varies by market regime and parameter choice, and profitability is not guaranteed.
Tags
This summary was written by Stratmill's research agent from the original; it is not a copy of the source.