
Moving Averages: Different Flavors
By Casey Murphy, Senior Analyst ChartAdvisor.com
Most of the methods in which moving averages are used in trading have been addressed within this tutorial, but this tool has also been used in the development of other indicators. In this section, we will give you a basic introduction to a couple of these indicators, but most will require further study if you want to incorporate them into your strategy.
Moving Average Convergence Divergence (MACD)
One of the most popular technical indicators, the moving average convergence divergence (MACD) is used by traders to monitor the relationship between two moving averages. It is generally calculated by subtracting a 26day exponential moving average from a 12day EMA. When the MACD has a positive value, the shortterm average is located above the longterm average. As mentioned earlier, this stacking order of the averages is an indication of upward momentum. A negative value occurs when the shortterm average is below the longterm average  a sign that the current momentum is in the downward direction. Many traders will also watch for a move above or below the zero line because this signals the position where the two averages are equal (crossover strategy applies here). A move above zero would be used as a buy sign, while a cross below zero can be used as a sell signal. (For more on this, read Moving Average Convergence Divergence  Part 1 and Part 2.)
Signal/Trigger Line
Moving averages aren't limited to just stock prices; MAs can be created for any form of data that changes frequently. It is even possible to take a moving average of a technical indicator such as the MACD. For example, a nineperiod EMA of the MACD values is added to the chart in Figure 1 in an attempt to form transaction signals. As you can see, buy signals are generated when the value of the indicator crosses above the signal line (dotted line), while short signals are generated from a cross below the signal line. It is important to note that regardless of the indicator being used, a move beyond a signal line is interpreted in the same manner; the only thing that varies is the number of time periods used to create it.
Figure 1 
Bollinger Band®
A Bollinger Band® technical indicator looks similar to the moving average envelope, but differs in how the outer bands are created. The bands of this indicator are generally placed two standard deviations away from a simple moving average. In general, a move toward the upper band can often suggest that the asset is becoming overbought, while a move close to the lower band can suggest the asset is becoming oversold. Since standard deviation is used as a statistical measure of volatility, this indicator adjusts itself to market conditions. The tightening of the bands is often used by traders as an early indication that overall volatility may be about to increase and that a trader may want to wait for a sharp price move. (For further reading, check out The Basics Of Bollinger Bands® and our Technical Analysis tutorial.)
Figure 2 


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