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Difference between Strategy 21(Holt) & Strategy 22( 2nd order exponential smoothing)

Hi guys,

Difference between Strategy 21(Holt) & Strategy 22( 2nd order exponential smoothing) as listed in APO DP.

G(t1) = alpha * V(t1) + (1-alpha) G(t1-1)

G(t2)= alpha * G(t1) + (1-alpha) G(t2-1)

Along with assumption used in SAP to calculate 1st ex-post point in the past

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