ATR

The Average True Range (ATR) is a technical analysis indicator that measures market volatility by decomposing the entire range of an asset price for that period. Introduced by J. Welles Wilder Jr. in his 1978 book "New Concepts in Technical Trading Systems", ATR is widely used to evaluate the degree of price volatility and is particularly useful in determining stop-loss and entry points.

How It Works

To calculate the ATR, first determine the true range for a given day, which is the highest of the following: the current high minus the current low, the absolute value of the current high minus the previous close, or the absolute value of the current low minus the previous close. The ATR is then derived by averaging out these true ranges over a specified number of periods, typically 14 days. For example, if a stock has daily true ranges of 1.5, 2.0, and 1.8 over three days, the ATR over these periods would be approximately 1.77, assuming a 14-day ATR calculation.

In practice, a trader might use the ATR to gauge how much a stock could potentially move on a given day. If a stock has an ATR of £2 and is currently priced at £100, it implies the stock could reasonably be expected to fluctuate between £98 and £102 within the day. This can be used to set stop-loss orders or to decide entry points for a trade. For instance, a trader might place a stop-loss order £2 below the entry price to manage risk effectively.

Key Points

• Volatility Measure: ATR provides a quantitative measure of volatility regardless of directional price movement.
• Not a Trend Indicator: ATR does not indicate price direction, solely price volatility.
• Adaptive Tool: Useful for setting stop-loss levels, as it adapts to changing market conditions.
• Period Sensitivity: The ATR value is sensitive to the number of periods used in its calculation.
• Combinable: Often used in conjunction with other indicators for comprehensive analysis.
• Market Agnostic: Can be applied across different asset classes including equities, forex, and commodities.

Relevance to Traders

For traders, understanding the ATR is crucial when selecting a broker, particularly for those who engage in strategies reliant on volatility measures. Brokers offering comprehensive charting tools that include ATR can provide traders with the necessary insights to manage risk and optimise entry and exit points effectively. Furthermore, low latency and reliable execution are essential for strategies based on ATR, as these ensure that trades are executed at anticipated prices, minimising slippage.

Choosing a broker with robust analytical tools can significantly enhance a trader's ability to employ the ATR effectively. Brokers that offer educational resources on how to use technical indicators like ATR can also be beneficial, especially for novice traders looking to augment their trading strategies.