표 1 추세유형

가정	추세유형
None	T h = l
Additive	T h = l + b h
Additive damped	T h = l + b φ h , φ h ≡ ∑ s = 1 h φ s
Multiplicative	T h = l ․ b h
Multiplicative damped	T h = l ․ b φ h , φ h ≡ ∑ s = 1 h φ s