What are Momentum Indicators?
Momentum indicators are tools utilized by traders to get a better understanding of the speed or rate at which the price of a security changes. Momentum indicators are best used with other indicators and tools because they don’t work to identify the direction of movement, only the timeframe in which the price change is occurring.
Advantages of Momentum Indicators
Momentum indicators show the movement of price over time and how strong those movements are/will be, regardless of the direction the price moves, up, or down.
Momentum indicators are also specifically useful, as they help traders and analysts spot points where the market can and will reverse. The points are identified through divergence between price movement and momentum.
Because momentum indicators show the relative strength of price movements but leave out the directionality of the price movements, such indicators are best utilized in combination with other technical indicators – such as trend lines and moving averages – which show price trends and directions.
Divergence occurs when, for example, the price of a stock is continually moving downward, following along with the momentum indicator being used (which signals strong momentum), but then the momentum indicator turns to the upside or no longer continues to follow the downward price movement. It means that the indicator’s diverged from the price movement and indicates that the momentum of the current price movement is failing.
The chart below shows how the Relative Strength Index (RSI) momentum indicator reveals impending price direction changes as the movement of the RSI diverges from the direction of price movement in the AUD/USD currency pair.
Divergence is typically an indication that the current price trend – due to the signal that momentum is stalling – is likely coming to an end and is about to reverse. When price movement and momentum diverge in an upward fashion, it is a bullish divergence. If price movement and the momentum indicator were continually moving upward and the momentum indicator suddenly turned to the downside, it would be a bearish divergence.
Popular Momentum Indicators
There are a variety of momentum indicators that traders can utilize. However, there are a few that are very popular with traders and widely used.
1. Moving Average Convergence Divergence (MACD)
The Moving Average Convergence Divergence (MACD) is one of the most popular momentum indicators. The MACD uses two indicators – moving averages – turning them into an oscillator by taking the longer average out of the shorter average. It means that the MACD indicates momentum as it oscillates between moving averages as they converge, overlap, and move away from one another.
As mentioned above, the MACD makes use of two moving averages. While it is up to the discretion of the trader or analyst, the indicator typically uses the 12-day and 26-day exponential moving averages (EMAs), subtracting the 26-day from the 12-day. The result is the MACD line, which is then usually graphed with a 9-day EMA, acting as a signal line that can identify price movement turns.
The truly important aspect of the MACD is the histogram, which reveals the difference between the MACD line and the 9-day EMA. When the histogram is positive – over the zero-midpoint line but begins to fall towards the midline – it signals a weakening uptrend. On the flipside, when the histogram is negative, under the zero-midpoint line but begins to climb towards it, it signals the downtrend is weakening.
2. Relative Strength Index (RSI)
The Relative Strength Index (RSI) is another popular momentum indicator. Also an oscillator, the RSI acts as a metric for price changes and the speed at which they change. The indicator fluctuates back and forth between zero and 100. Signals can be spotted by traders and analysts if they look for divergences, failed swings of the oscillator, and when the indicator crosses over the centerline.
Any rising RSI values above 50 signal positive, uptrend momentum, though, if the RSI hits 70 or above, it’s often an indication of overbought conditions. Conversely, RSI readings that decrease below 50 show negative, downtrend momentum. If RSI readings are below 30, though, it is an indication of possible oversold conditions.
3. Average Directional Index (ADX)
Finally, the Average Directional Index (ADX) must be mentioned. In reality, creator Welles Wilder established the Directional Movement System – consisting of the ADX, the Minus Directional Indicator (-DI), and the Plus Directional Indicator (+DI) – as a group that could be used to help measure both the momentum and direction of price movements.
The ADX is derived from the smoothed averages of the -DI and +DI, which are themselves derived from the comparison of two consecutive lows and their respective highs. The index is the portion of the Directional Movement System that acts as a metric for the strength of a trend, regardless of its direction. It’s important to note that with the ADX, values of 20 or higher suggest the presence of a trend. For any reading lower than 20, the market is viewed as “directionless.”
Momentum indicators are vital tools for traders and analysts; however, they are rarely used in isolation. It is more common to utilize them with other technical indicators that reveal the directions of trends. Once a direction’s been determined, momentum indicators are valuable because they indicate the strength of price movement trends and when they are coming to an end.
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