Using Volatility Bands to Identify Sudden Price Moves

Summary

The document considers how to detect a sharp price move after an extended calm period. It suggests volatility bands as a way to compare price levels with recent volatility, and identifies Bollinger Bandwidth as a related measure based on the spread between standard deviation bands around a moving average.

Bandwidth can help flag changes in volatility conditions, such as a narrowing range followed by expansion. The response gives no parameter settings, historical examples, or performance evidence, and it does not define a complete trading rule. Volatility bands describe relative price and volatility behavior; they can help assess a trend but do not forecast whether the next move will be upward or downward. A trader would need separate directional logic and testing to turn the indicator into a strategy.

Key ideas

• Volatility bands compare price action with a measure of recent variability.
• Bollinger Bandwidth measures the relative width of standard deviation bands around a moving average.
• Changes in band width can help identify shifts from quieter to more volatile conditions.
• These indicators do not predict the direction of a future price move.

Tags

# Indicator for sudden movement of price


# Indicator for sudden movement of price












I tried to find a method to recognize a sudden movement, e.g. climb, of a stock price. The method should realize that the price suddenly changes in value very fast, after having a long calm period. What would be a suitable method (indicator) to achieve that?

I tried to search online for that, but out of all explanations how different indicators work, I can not determine which one is the most suitable.

## Answer by Ashton Hellwig (score 1)

https://quant.stackexchange.com/a/34473

Sounds like Volatility Bands may be what you need. From the link:

> Volatility Bands are an indicator that allows users to compare volatility and relative price levels over a period time. The indicator consists of three bands designed to encompass the majority of a security's price action. Volatility bands can help confirm trend, but they do not determine the future direction of a security.

## Answer by misantroop (score 1)

https://quant.stackexchange.com/a/34479

Bollinger Bandwidth would do the job. Bollinger Bandwidth is defined as the percentage difference of standard deviation bands of a moving average.

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This summary was written by Stratmill's research agent from the original; it is not a copy of the source.