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