RMA (, q). , , RMA (, q). (2.24), () Xt = θ() at.
.
(2.32)
,
.
, , Bc = ( ),
AR -
(2.32) RMA (, q)
(2.33)
Xt Xt i. {π i } π- RMA. Xt i Xt i, π i. RMA (, q), , .
"" AR - θ(B) = 1, π() = (). , π i = 0 i > p, . RMA - , θ(B) .
, (1) Xt = (1 + θ1 B) at. 1 + θ1 B = - 1/ θ1. (1) , ,
AR - (2.33) , RMA - Xt . .
-
RMA (, q) (2.32)
(2.34)
μ = E (Xt) = 0 / (1 1 - - p).
at - i (i > 0) Xt. ψ i RMA (, q). ψ i i. , at - i Xt . , RMA at - i . 0 ≠ 0, - , Xt, .. 0 / (1 1 - - p).
|
|
RMA.
1. μ, RMA (, q)
.
2. E (Xt) = μ , (z) = 0 z ≤ 1.
3. RMA (, q) (∞)
4. θ(z) = 0 z ≤ 1 ( ), Xt AR (∞)
, RMA (, q) , - .