The unit sales of a new drug for the first
The unit sales of a new drug for the first 25 months after its introduction to the marketplace are recorded in the file P12_15.xlsx. Specify one or more promising auto regression models based on autocorrelations of this time series. Estimate each model with the available data. Which model provides the best fit to the data? Use the best auto regression model you found to forecast the sales of this new drug in the 26th month.

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