Hi all,

I want to specify p,d,q,P,D,Q,s in general $\displaystyle SARIMA(p,d,q)\times(P,Q,D)_s$ models for the following time series $\displaystyle x_t$.

$\displaystyle z_t=(1-0.5B)x_t$ and $\displaystyle z_t=0.6z_{t-1} + w_t$, where $\displaystyle w_t$ is WN(0,1)

In this case, am i right to say that P,Q,D,s,q=0 and p,d=1?

$\displaystyle x_t=0.6x_{t-1}+z_t$ and $\displaystyle z_t=0.2z_{t-5} + w_t$, where $\displaystyle w_t$ is WN(0,1)

I am unsure of this identification too...