This Is One Of The Most Popular Charting Tools For Traders
Moving averages (MAs) are one of the most popular trading tools. They’re simple and easy to understand. Before there were calculators or computers, traders found simple 10-day moving averages by adding up the last 10 closing prices and moving the decimal point one space to the left.
Now, MAs of any length are easy to calculate and widely used. We also have variations of the simple calculation. Rather than just adding up numbers and dividing by the total number, there are at least four other possible ways to find a moving average:
1. Exponential Moving Average: Assigns a greater weight to the more recent market action in an effort to be more responsive to changes in the trend.
2. Weighted Moving Average: Allows users to decide which data should be overweighted and allows for the weighting values to be changed.
3. Triangular Moving Average: Weights the middle of the data more heavily.
4. Adaptive Moving Average: Uses smoothing factors to adjust the number of days used in the calculations to current market conditions.
How Traders Use Moving Averages
Each method has its proponents. And each of the four methods adds a level of complexity to what was originally a simple indicator. Complexity is only OK if it adds value. Visually, it looks like the different moving averages move in the same general direction.
The chart below is a weekly historical chart of the SPDR S&P 500 ETF (NYSE: SPY). Prices are hidden so all we see are the moving averages. This eliminates the clutter on the chart and makes it possible to see the moving averages rising and falling at the same time.
Large delays at bottoms are one of the most significant drawbacks of trading with a moving average. The other significant drawback is that there are a large number of small trades in a sideways market.
The adaptive moving average, the thin red line, stands out as consistently lagging the simple MA, shown as the thick blue line. At the bottom in 2009, the exponential MA, the brown line, was the last to signal a buy. That signal came after SPY had gained more than 35%. The other MAs signaled a buy after a gain of 25%.
Based on the visual comparison, we can say that the averages are all close to each other. More detailed quantitative testing of the various MAs is required to develop a stronger opinion as to which one is best.
Why Moving Averages Matter To Traders
In our experience, using MAs for bearish short trades can lead to large losses. We prefer using MAs for long-only trades, moving to cash when prices fall below the MA.
At the time of this writing, SPY is below its adaptive MA. Therefore, a trade in SPY would not be recommended at this time. (Of course, the precise value of the MA changes daily.)
However sophisticated you want to get with MAs is ultimately up to you. Just know that MAs will not call the top of the market. In fact, because it is calculated with historical data, it is impossible for any MA to signal at the exact top or bottom.
There is no way to fully eliminate the problems associated with moving averages. But the best way to use them is to apply MAs as a long-only signal. No matter what type of MA is used, when the prices are below the MA, the chances of profitable buys are low. Consider selling any stock or ETF when the price moves below the 26-week moving average.
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