Time series smoothing

What happens if a = 0 ?

Then SFt + 1 = SFt (What does this mean?)

What happens if a = 1 ?

Then SFt + 1 = At (What does this mean?)

Single Exponential Smoothing

SFt + 1 = aAt + (1 - a)SFt

= SFt + a(At - SFt)

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