: The middle band minus two standard deviations. It often marks potential "oversold" areas. Three Primary Trading Strategies Go to product viewer dialog for this item.
: The middle band plus two standard deviations . It often marks potential "overbought" areas. Bollinger Band Trading
The Bollinger Bands Trading Strategies: With Practical Charts and Codes to Use : The middle band minus two standard deviations
: A 20-period Simple Moving Average (SMA) that acts as the baseline. Bollinger Band Trading