Time series smoothingWhy is it called Single Exponential Smoothing?

SF4 = aA3 + a(1- a) A2 + a (1- a)2A1 + (1- a)3 SF1

Observe that for a < 1,

a (1- a)2 < a(1- a) < a

Which reveals that single exponential smoothing is a form of weighted moving average where the older the data is, the more it’s attenuated

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