(a) Consider two MA(2) processes: one with 01 02 = and another with 0₁ = -1 and 02 = 6. (i) Show that these processes ha
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(a) Consider two MA(2) processes: one with 01 02 = and another with 0₁ = -1 and 02 = 6. (i) Show that these processes ha
(a) Consider two MA(2) processes: one with 01 02 = and another with 0₁ = -1 and 02 = 6. (i) Show that these processes have the same autocorrelation function. (ii) Are the two processes invertible? Explain your answer. (6 marks) (4 marks) (b) For a fixed positive integer r and constant, consider the time series given by Y₁ = ₁ + pe₁-1 +6²e₁-2 + ..... + d'e₁-r. (i) Show that this process is stationary for any value of . (5 marks) (ii) Find the autocorrelation function of (Y,). (3 marks)
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