StandardErrorBands

Is a statistical indicator.
Is computed using the closing price.
Returns three time series. The first is a 3-period simple moving average of the 21-period linear regression indicator. The second and third series are bands that are two standard errors above and below the moving average.
FinancialIndicator["StandardErrorBands", n1, n2, b] uses period- linear regression, period- moving averages, and bands b standard errors from the moving average.
The first values in the time series are computed using partial periods.
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