# How To Use Average True Range (ATR) Indictor for Predicting Trend Reversals

Typically, indicators deal with predicting the price direction. However, Average True Range indicator (ATR) is different as it is a volatility indicator. ATR basically shows the level of interest or level of disinterest in a particular price movement of a stock.

## Why Was ATR developed?

Welles Wilder developed Average True Range indicator for stocks and commodities that are quite volatile. Such stocks frequently open with gap moves as well as limit moves. As the then-existing formulas for volatility did not account for these gap and limit moves, Wilder developed ATR for capturing this omitted volatility.

## Understanding the Calculation Behind Average True Range

The calculation of ATR just requires historical data of price.

Step 1: The first step in the calculation of Average True Range indicator is to find out the True Range.

True Range (TR) is basically the biggest of any of the below three values and is used for determining the level of volatility.

Value #1:  Current High – Current Low

Value #2: absolute value |Current High – Previous Close|

Value #3: absolute value |Current Low – Previous Close|

Hence, TR = max (value1, value2, value3)

This is depicted in the below figure for ease of understanding. The values of ‘Today’s candle’ signifies current values, while the values of ‘Yesterday’s candle’ signifies previous values. Step 2:  Calculate the Average True Range. This is actually the ‘N’ day exponential moving average of True Ranges (TR). Usually, the value of ‘N’ is 14 days.

ATR = ‘N’ day EMA of TR

Hence, value of today’s (current) ATR = {(13 * Previous ATR) + Current TR}/ 14

## Use of Average True Range Indicator

Average True Range Indicator is used for early identification of trend changes and for validating whether the move or breakout is valid.

• Whenever there are strong moves of the stock (in either direction), it would be accompanied by a large value of Average True Range, especially at the beginning of the move.
• On the other hand, false or uninspiring moves are usually accompanied by relatively narrow ranges.

For example, when there is a bullish reversal and the value of ATR increases, it shows that there is a strong buying pressure, thus reinforcing the reversal. On the other hand, when there is a bearish reversal with an increase in ATR, it shows strong selling pressure, reinforcing the support break.

Basically, a high value of Average True Range Indicator warns that a market top or market bottom being formed.

The figure below shows that a high value of ATR leads to a price rally. To confirm this, moving average cross was also taken into account. 