Question
The last 15 months of sales data are given below: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov D 2020 13.7
The last 15 months of sales data are given below: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov D 2020 13.7 14.7 14.8 13 14 13.4 13.6 14.9 13.5 14.7 15.7 219 2021 16.9 16.3 14.7 X+ represents sales in month t. Let Yt = log (Xt) and let Zt = Yt - Yt-12. Then the following model was fitted: Zt = 0.52Zt-1 +0.38Z+-2+ Et where Et is white noise. b. Using the Zt model, write down the model for Yt. Is the model for Yt stationary?
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Accounting for Governmental and Nonprofit Entities
Authors: Earl R. Wilson, Jacqueline L Reck, Susan C Kattelus
15th Edition
978-0256168723, 77388720, 256168725, 9780077388720, 978-007337960
