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Moving Averages

Types of Moving Averages

The three most popular types of moving averages are Simple Moving Averages (SMA), Exponential Moving Averages (EMA), and Linear Weighted Moving Averages. While the calculation of these moving averages differs, they are used in the same way to help assist traders in identifying short-, medium-, and long-term price trends.

Simple Moving Average

The most common type of moving average is the simple moving average, which simply takes the sum of all of the past closing prices over a time period and divides the result by the total number of prices used in the calculation. For example, a 10-day simple moving average takes the last ten closing prices and divides them by ten.


>Figure 15 – Simple Moving Averages – Source:

Figure 15 shows a stock chart with both a 50-day and 200-day moving average. The 50-day moving average is more responsive to price changes than the 200-day moving. In general, traders can increase the responsiveness of a moving average by decreasing the period and smooth out movements by increasing the period.

Critics of the simple moving average see limited value because each point in the data series has the same impact on the result regardless of when it occurred in the sequence. For example, a price jump 199 days ago has just as much of an impact on a 200-day moving average as one day ago. These criticisms sparked traders to identify other types of moving averages designed to solve these problems and create a more accurate measure.

Linear Weighted Average

The linear weighted average is the least common moving average, which takes the sum of all closing prices, multiplies them by the position of the data point, and divides by the number of periods. For example, a five-day linear weighted average will take the current closing price and multiple it by five, yesterday’s closing price and multiple it by four, and so forth, and then divide the total by five. While this helps resolve the problem with the simple moving average, most traders have turned to the next type of moving average as the best option.

Exponential Moving Average

The exponential moving average leverages a more complex calculation to smooth data and place a higher weight on more recent data points. While the calculation is beyond the scope of this tutorial, traders should remember that the EMA is more responsive to new information relative to the simple moving average. This makes it the moving average of choice for many technical traders.


>Figure 16 – EMA v. SMA Moving Averages – Source:

Figure 16 shows how the EMA (red line) reacts more quickly than the SMA (blue line) when sudden price movements occur. For example, the breakout in late-November caused the EMA to move higher more quickly than the SMA even though both are measuring the same 50-day period. The difference may seem slight, but it can dramatically affect returns.

How to Use Moving Averages

Moving averages are helpful for identifying current trends and support or resistance levels, as well as generating actual trading signals.

The slope of the moving average can be used as a gauge of trend strength. In fact, many momentum based indicators (as we will see in the next section) look at the slope of the moving average to determine the strength of a trend. For example, Figure 16 (above) has moving average slopes that clearly show a moderate sideways period between September and October and a significant upswing between December and April.

Many technical analysts often look at multiple moving averages when forming their view of long-term trends. When a short-term moving average is above a long-term moving average, that means that the trend is higher or bullish, and vice versa for short-term moving averages below long-term moving averages.

Moving averages can also be used to identify trend reversals in several ways:

Price Crossover

The price crossing over the moving average can be a powerful sign of a trend reversal, while the price crossing above the moving average indicates a bullish breakout ahead. Often, traders will use a long-term moving average to measure these crossovers since the price frequently interacts with shorter-term moving averages, which creates too much noise for practical use.

MA Crossover

Short-term moving averages crossing below long-term moving averages is often the sign of a bearish reversal, while a short-term moving average crossover above a long-term moving average could precede a breakout higher. Longer distances between the moving averages suggest longer term reversals as well. For instance, a 50-day moving average crossover above a 200-day moving average is a stronger signal than a 10-day moving average crossover above a 20-day moving average.


Figure 17 – Crossover and Support Illustrations – Source:

And finally, moving averages can be used to identify areas of support and resistance. Long-term moving averages, such as the 200-day moving average, are closely watched areas of support and resistance for stocks. A move through a major moving average is often used as a sign from technical traders that a trend is reversing.


Moving averages are a powerful tool for traders analyzing securities. They provide a quick glimpse at the prevailing trend and trend strength, as well as specific trading signals for reversals or breakouts. The most common timeframes used when creating moving averages are the 200, 100, 50, 20, and 10-day moving averages. The 200-day moving average is a good measure for a year timeframe, while shorter moving averages are used for shorter timeframes.

These moving averages help traders smooth out some of the noise found in day-to-day price movements and give them a clearer picture of the trend. In the next section, we will take a look at some of the other techniques used to confirm price and movement patterns.

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