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TS Module 9: Non-stationary ARIMA time series HW (The attached PDF file has better formatting.) Homework assignment: Non-stationary autoregressive process A time series Yt = â × Yt-1 + åt has = 3, where k is a constant. (The textbook has â = 3.)
A. What is the variance of Yt as a function of â and t? B. What is ñ(yt,yt-k) as a function of â, k, and t?
See equations 5.1.4 and 5.1.5 on page 89. {Note: This homework assignment has been replaced because of an unclear equation in the textbook; see the new homework assignment. If you have submitted this assignment already, you will be given credit.}
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