ā
ā
𝑦
𝑡= 𝑔
𝑡+ 𝑐
𝑡𝑴𝒊𝒏 {∑
𝑇𝑡=1𝑐
𝑡2+ 𝜆 ∑
𝑇𝑡=1[(𝑔
𝑡− 𝑔
𝑡−1) − (𝑔
𝑡−1− 𝑔
𝑡−2)]
2} {𝑔
𝑡)
𝑡=−1 𝑇λ
λ λ
(𝑔
𝑡= 𝑦
𝑡) λ λ →∞
𝑔
𝑡= 𝛽 ∗ 𝑡
λ
λ
λ λ
𝑔𝑎𝑝 = 𝑥
𝑖− 𝑥
𝑖𝑡𝑚𝑜𝑛𝑡ℎ
𝑖𝑥
𝑖𝑡𝑚𝑜𝑛𝑡ℎ
𝑖σ
𝜎 = √
𝑁−11∑
𝑛(𝑥
𝑖− 𝑥
𝑖𝑡𝑖=1
)
2𝑥
𝑖𝑡− 𝑘𝜎
𝑥
𝑖𝑡+ 𝑘𝜎
μ μ
(𝑦
𝑡−𝜇
𝑠𝑡) = 𝜑
1((𝑦
𝑡−𝜇
𝑠𝑡−1) + 𝜑
2((𝑦
𝑡−𝜇
𝑠𝑡−2) + 𝜑
3((𝑦
𝑡−𝜇
𝑠𝑡−3) +
𝜑
4((𝑦
𝑡−𝜇
𝑠𝑡−4) + 𝜀
𝑡ε σ
𝑦
𝑡= 𝜇
𝑠𝑡+ 𝜀
𝑡𝜀
𝑡~ 𝑁(0, 𝜎
𝑠𝑡2)
μ μ μ σ σ
σ
𝑝(𝑦
𝑡|𝑍
𝑡; 𝜃) =
1√2𝜋𝜎𝑎𝑡
exp {−
(𝑦𝑡2𝜎−𝜇𝑠𝑡)2𝑠𝑡2
}
𝑝(𝑠
𝑡= 𝑗|𝑠
𝑡−1= 𝑖) = 𝑝
𝑖𝑗∑
𝐾𝑝
𝑖𝑗𝑗=1
= 1 𝑓𝑜𝑟 𝑖 = 1, … , 𝐾
𝑝(𝑠
𝑡= 1|𝑠
𝑡−1= 1) = 𝑝
11,𝑝(𝑠
𝑡= 2|𝑠
𝑡−1= 1) = 𝑝
12,𝑝(𝑠
𝑡= 3|𝑠
𝑡−1= 1) = 𝑝
13,𝑝(𝑠
𝑡= 1|𝑠
𝑡−1= 2) = 𝑝
21,𝑝(𝑠
𝑡= 2|𝑠
𝑡−1= 3) = 𝑝
22,𝑝(𝑠
𝑡= 3|𝑠
𝑡−1= 3) = 𝑝
23,
ki i t t
t
t
A X
x
1 1
μ ε
t i t k
i i t
t
t
x x
x
1 1 1Π Γ Π
λ β Π λβ λ
β
𝜋
[
∆ 𝑙𝑛𝑟𝑡𝑓
𝑡∆ 𝑙𝑛𝑔
𝑡∆ 𝑖𝑛𝑓
𝑡∆𝑓𝑡𝑣
𝑡∆ 𝑟𝑟𝑖𝑏
𝑡∆ 𝜋
𝑡] =
[ 𝛼
10𝛼
20𝛼
30𝛼
40𝛼
50𝛼
60] +
[
𝛼
11𝛼
12𝛼
13𝛼
14𝛼
15𝛼
16𝛼
17𝛼
21𝛼
22𝛼
23𝛼
24𝛼
25𝛼
26𝛼
27𝛼
31𝛼
32𝛼
33𝛼
34𝛼
35𝛼
36𝛼
37𝛼
41𝛼
42𝛼
43𝛼
44𝛼
45𝛼
46𝛼
47𝛼
51𝛼
52𝛼
53𝛼
54𝛼
55𝛼
56𝛼
57𝛼
61𝛼
62𝛼
63𝛼
64𝛼
65𝛼
66𝛼
67] [
∆ 𝑙𝑛𝑟𝑡𝑓
𝑡−𝑖∆ 𝑙𝑛𝑔
𝑡−𝑖∆ 𝑖𝑛𝑓
𝑡−𝑖∆ 𝑓𝑡𝑣
𝑡−𝑖∆ 𝑟𝑟𝑖𝑏
𝑡−𝑖∆ 𝜋
𝑡−𝑖] +
[ 𝜀
1𝑡𝜀
2𝑡𝜀
3𝑡𝜀
4𝑡𝜀
5𝑡𝜀
6𝑡]
[
∆ 𝑙𝑛𝑟𝑡𝑓
𝑡∆ 𝑙𝑛𝑔
𝑡∆ 𝑙𝑛𝑧
𝑡∆ 𝑙𝑛𝑠
𝑡∆𝑓𝑡𝑣
𝑡∆ 𝑟𝑟𝑖𝑏
𝑡] =
[ 𝛽
10𝛽
20𝛽
30𝛽
40𝛽
50𝛽
60] +
[
𝛽
11𝛽
12𝛽
13𝛽
14𝛽
15𝛽
16𝛽
21𝛽
22𝛽
23𝛽
24𝛽
25𝛽
26𝛽
31𝛽
32𝛽
33𝛽
34𝛽
35𝛽
36𝛽
41𝛽
42𝛽
43𝛽
44𝛽
45𝛽
46𝛽
51𝛽
52𝛽
53𝛽
54𝛽
55𝛽
56𝛽
61𝛽
62𝛽
63𝛽
64𝛽
65𝛽
66] [
∆ 𝑙𝑛𝑟𝑡𝑓
𝑡−𝑖∆ 𝑙𝑛𝑔
𝑡−𝑖∆ 𝑖𝑛𝑓
𝑡−𝑖∆ 𝑓𝑡𝑣
𝑡−𝑖∆ 𝑟𝑟𝑖𝑏
𝑡−𝑖∆ 𝜋
𝑡−𝑖] +
[ 𝜇
1𝑡𝜇
2𝑡𝜇
3𝑡𝜇
4𝑡𝜇
5𝑡𝜇
6𝑡]
Δ α β
𝑡
−𝑖ε μ
𝜋
-.2 -.1 .0 .1 .2 .3
04 05 06 07 08 09 10 11 12 13 14 15 16 17
ACTUAL FITTED
-.3 -.2 -.1 .0 .1 .2 .3
04 05 06 07 08 09 10 11 12 13 14 15 16 17
A CTUA L FILTE RE D
𝜋
-1.5 -1.0 -0.5 0.0 0.5 1.0 1.5
-1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 Inverse Roots of AR Characteristic Polynomial
-1.5 -1.0 -0.5 0.0 0.5 1.0 1.5
-1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 Inverse Roots of AR Characteristic Polynomial