Overview
Bollinger bands rely on standard deviations in order to adjust to changing market conditions. When a stock becomes volatile the bands widen (move further away from the average). Conversely, when the market becomes less volatile the bands contract (move closer to the average). Tightening of the bands is often used as an early indication that the stock's volatility is about to increase.

Interpretation
Bollinger Bands (as with most bands) can be imposed over an actual price or another indicator. When prices rise above the upper band or fall below the lower band, a change in direction may occur when the price penetrates the band after a small reversal from the opposite direction.

Overview
Bollinger bands rely on standard deviations in order to adjust to changing market conditions. When a stock becomes volatile the bands widen (move further away from the average). Conversely, when the market becomes less volatile the bands contract (move closer to the average). Tightening of the bands is often used as an early indication that the stock's volatility is about to increase.

Interpretation
Bollinger Bands (as with most bands) can be imposed over an actual price or another indicator. When prices rise above the upper band or fall below the lower band, a change in direction may occur when the price penetrates the band after a small reversal from the opposite direction.

Overview
This novel indicator identifies the nearest prime number for the high and low and plots the two series as bands.