Single Exponential Smoothing

The Exponential Moving Average is a weighted average whose weights are exponentially decreasing from more recent historical samples to older historical values.

 MA(t) =  α X(t) + (1-α) MA(t-1)

where α is the smoothing factor. To compute an α factor that is roughly equivalent to the simple moving average window we can use the simple formula:

    α = 2 / (k + 1)

where k is the window length.