Wolfram Language & System 10.3 (2015)|Legacy Documentation

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ExponentialMovingAverage

Commonly abbreviated as EMA.
Is a statistical indicator.
Returns one time series, which is a moving average of the previous 10 periods with smoothing constant .
Is computed using the closing price.
FinancialIndicator["ExponentialMovingAverage",n] uses the preceding n periods and smoothing constant .
The initial values in the time series are computed using partial periods.