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Simple Moving Average (SMA) Explained. A simple moving average (SMA) is the simplest type of moving average in forex analysis (DUH!). Basically, a simple moving average is calculated by adding up the last âXâ periodâs closing prices and then dividing that number by X.
A 3-interval moving average can be created and placed on the chart using nearly the same procedure as follows. Note that the most recent period is assigned the weight of 3, the period prior to that is assigned and weight of 2, and the period prior to that is assigned a weight of 1.