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Time series forecasting problem:Airline data

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Consider the airline ticket data in the attached file.
a. Create a time series chart of the data. Based on what you see, which of the exponential smoothing models do you think should be used for forecasting? why?
b. Use simple exponential smoothing to forecast these data, using no holdout period and requesting 12 months of future forecasts. Use the default smoothing constant of 0.1.
c. Write part b, optimizing the smoothing constant. does it make much of an improvement?
d. Write a short report to summarize your results. hide problem.

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