Using the Phones Direct data in Exercise 6, repeat Holts model with = 0.4 and

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Using the Phones Direct data in Exercise 6, repeat Holt’s model with α

= 0.4 and β = 0.5. Compare the performance of Holt’s model with α =

0.08 and β = 0.15. Which combination of smoothing constraints do you prefer? Why?

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