Whether you are using the 50-day, 100-day or 200-day moving average, the method of calculation and the manner in which the moving average is interpreted remain the same.
A moving average is simply an arithmetic mean of a certain number of data points. The only difference between a 50-day moving average and a 200-day moving average is the number of time periods used in the calculation. The 50-day moving average is calculated by summing up the past 50 data points and then dividing the result by 50, while the 200-day moving average is calculated by summing the past 200 days and dividing the result by 200. (To learn more, see our Moving Averages tutorial.)
Simple moving averages (SMA) are often viewed as a low-risk area to place transactions, since they correspond to the average price that all traders have paid over a given time frame. For example, a 50-day moving average is equal to the average price that all investors have paid to obtain the asset over the past 10 trading weeks (or two and a half months), making it a commonly used support level.
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Similarly, the 200-day moving average represents the average price over the past 40 weeks, which is used to suggest a relatively cheap price compared to the price range over most of the past year. Once the price falls below this average, it may act as resistance because individuals who have already taken a position may consider closing the position to ensure that they do not suffer a large loss.
Critics of technical analysis say that moving averages act as support and resistance because so many traders use these indicators to inform their trading decisions. For more on this debate, see "Can Technical Analysis Be Called a Self-Fulfilling Prophecy?"