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Home Technical Analysis
ADX Indicator

An Overview of Average Directional Index(ADX)

Elearnmarkets by Elearnmarkets
November 22, 2021
in Technical Analysis, Charts, Patterns & Indicators
Reading Time: 5 mins read
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In 1987 J. Welles Wilder developed the Average Directional Index (ADX) as an indicator of trend strength.

He developed ADX Indicator with commodities and daily prices in mind but it can also be applied to stocks.

ADX quantifies the velocity of price regardless of its north/south/eastward movement.

Hence, two other lines i.e. Positive Directional Indicator (+DI) and Negative Directional Indicator (-DI) are used on the charting system which act as complements to ADX.

Nowadays it has become one of the favourite indicators for technical analysts who study the historical price against time to analyse the supply and demand forces in the market.

“Trend is your friend” is a common belief of traders.

Once the trend is identified the next important thing is “timing”.

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The challenge is to determine the best time to enter and exit a trade.

Hence, a chartist can use the trio of lines together as discussed above to determine both the direction and strength of the trend.

The trio of lines i.e. ADX, +DI, -DI

The backbone of ADX Indicator

Directional movement indicators (DMI) i.e. Positive Directional Indicator (+DI) & Negative Directional Indicator (-DI) act as the pillars of ADX, which is a moving average of the DMI.

DMI is used to identify a definable trend.

The scale for the DMI ranges from 0 to 100. Any negative value in DMI is considered as zero.

Positive Directional Indicator (+DI)

To mark the beginning of uptrend analysts watch for the Positive Directional Indicator to cross above the Negative Directional Indicator.

It should have an upward sloping curve to represent the uptrend.

The steeper the curve the stronger is the uptrend.

The DMI is positive (plus) when the current high minus the prior high is greater than the prior low minus the current low.

It is a key component in the calculation of ADX.

Positive Directional Indicator

Negative Directional Indicator (-DI)

To mark the beginning of downtrend analysts watch for the Negative Directional Indicator to cross above the Positive Directional Indicator.

It should have an upward sloping curve to represent the downtrend.

The steeper the curve the stronger is the downtrend.

The DMI is negative (minus) when the prior low minus the current low is greater than the current high minus the prior high.

It is a key component in the calculation of ADX.

Also Read: RSI Indicator and How is it useful in Trading Stocks?

Negative Directional Indicator crossed Positive Directional Indicator

Calculation of ADX

To calculate +DI and −DI, a chartist needs price data consisting of High(H), Low(L), and Closing(C) prices of each period.

Once the data is available one can analyse and predict the trend accordingly.

Mathematics behind trend
Mathematics behind trend

After adjusting the number of periods (Wilder used 14 days), +DI and −DI are:

+DI = 100 times the smoothed moving average of (+DM) divided by average true range*

−DI = 100 times the smoothed moving average of (−DM) divided by average true range

The smoothed moving average is calculated over the number of periods selected, and the average true range is a smoothed average of the true ranges. So,

A.D.X. = 100 times the smoothed moving average of the absolute value of (+DI − −DI) divided by (+DI + −DI)

Note –  Variations of this calculation typically involve using different types of moving averages, such as an EMA, WMA etc.

To know more about ADX, you can watch the video below:

https://youtu.be/SW-Bhy3bv7E

A short video on ADX

*Average True Range (ATR)

It is an indicator developed by Welles Wilder to measure volatility in commodities.

A volatility formula based only on the high-low range would fail to capture volatility from gap or limit moves.

Hence, to capture this “missing” volatility Wilder created ATR.

It does not provide an indication of price direction rather only describes volatility.

Also Read: A complete overview on trend and theory of retracement

Calculation

Normally, the ATR is based on 14 periods and can be calculated on any time frame.

To start the process we need to find the first TR** value which is simply the High minus the Low, and the first 14-day ATR which is the average of the daily TR values for the last 14 days.

Then Wilder sought to smooth the data by incorporating the previous period’s ATR value.

Current ATR = [(Prior ATR x 13) + Current TR] / 14

– Multiply the previous 14-day ATR by 13.

– Add the most recent day’s TR value.

– Divide the total by 14

**True Range (TR) is a concept started by Wilder, which is defined as –

  • Method 1: Current High less the Current Low
  • Method 2: Current High less the Previous Close (Absolute value)
  • Method 3: Current Low less the Previous Close (Absolute value)

Note – Absolute values are used to ensure positive numbers.

 ADX Indicator Scale

Parameters for Trend Strength
Parameters for Trend Strength
ADX Below 25
ADX Below 25
ADX Above 25 And 50
ADX Above 25 And 50

Basic Strategy

 By quantifying the trend strength a chartist can identify the strongest and most profitable trends to trade.

A lower value indicates a sign of accumulation or distribution.

Also Read: How to get trading signals using Accumulation Distribution Line (ADL)?

On an average, if ADX is below 25 for more than 30 bars, price enters into a range and has a possibility to consolidate.

From this choppy movement, it gives a break out to initiate a new trend.

Accordingly, when the ADX line rises, trend strength also increases.

To mark the beginning of uptrend chartists watch for the Positive Directional Indicator to cross above the Negative Directional Indicator, whereas, to mark the beginning of a downtrend chartists watch for the Negative Directional Indicator to cross above the Positive Directional Indicator.

There is a common misperception that a falling ADX will reverse the trend.

It simply means the strength of the trend is weakening.

In layman’s terms, a series of higher ADX peaks means trend momentum is increasing whereas a series of lower ADX peaks means trend momentum is decreasing.

It can also show momentum divergence.

It suggests that price makes a higher high and ADX makes a lower high.

A divergence is not a signal for a reversal but just a warning that trend momentum is changing. It may lead to trend continuation, consolidation, correction or reversal.

ADX not only helps to identify breakouts but also to understand when breakouts are valid.

When it crosses 25 from below the trend gets strong enough to continue in the direction of the breakout.

Bottomline:

A trader gains the most from trading the strongest trends.

ADX indicator not only helps the chartist to identify trending conditions but also it helps to find the strongest trends to trade.

It also protects a risk-averse trader as an alert system to changes in trend momentum.

Though at the end it is the ability of a chartist to quantify the trend strength and stay one step ahead.

Thus, ADX should be used in tandem with other technical indicators and technical chart patterns in order to generate better trading signals.

Keep Learning!!

Tags: advanceADXChartenglishMarket Analysistechnical analysis
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