Stationary or invertible variable
Let et~ WN(0,2). State for each of the following model whether it is stationary and whether it is invertible. Explain your answer.
a) Zt= 1+ 0.5Zt-1 + et, t=1,2.3....
b) Zt= et - 1.5et-1 + 0.5et-2, t=1,2,3,
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