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The simple moving average (SMA) is the most basic of the moving averages used for trading. The simple moving average formula is calculated by taking the average closing price of a stock over the given periods.

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An average of a predetermined number of prices over a number of days, divided by the number of entries.

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In other words, this is the average stock price over a certain period of time. Keep in mind that equal weighting is given to each daily price. As shown in the chart above, many traders watch for short-term averages to cross above longer-term averages to signal the beginning of an uptrend. As shown by the blue arrows, short-term averages (e.g. 15-period SMA) act as levels of support when the price experiences a pullback. Support levels become stronger and more significant as the number of time periods used in the calculations increases.

Generally, when you hear the term "moving average", it is in reference to a simple moving average. This can be important, especially when comparing to an exponential moving average (EMA).

Source(s):

investopedia.com

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A simple moving average (or arithmetic mean) is calculated by adding the last n prices and plotting the value on the graph. A new value of the average is calculated for each new period hence the term “moving”.

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A simple, or arithmetic, moving average that is calculated by adding the closing price of the security for a number of time periods and then dividing this total by the number of time periods.

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A moving average calculation in which all past periods considered have equal weight and are not factored or smoothed.

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a moving average, also called rolling average, rolling mean or running average, is a type of finite impulse response filter used to analyze a set of data points by creating a series of averages of different subsets of the full data set.

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In other words, this is the average stock price over a certain period of time. Keep in mind that equal weighting is given to each daily price. As shown in the chart above, many traders watch for short-term averages to cross above longer-term averages to signal the beginning of an uptrend. As shown by the blue arrows, short-term averages (e.g. 15-period SMA) act as levels of support when the price experiences a pullback. Support levels become stronger and more significant as the number of time periods used in the calculations increases.

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An average of a predetermined number of prices over a number of days, divided by the number of entries.