The data below show retail sales at hardware stores in the United States monthly between January 1992
Question:
a. Plot the series. What can you learn from examining this plot?
b. Calculate and display the first 24 autocorrelations for the series. What do the ACF and PACF suggest about the series?
c. Suggest a possible set of differencing to use with the series.
d. Estimate an ARIMA model that you believe to be a good candidate for forecasting future retail sales at hardware stores. Test the Ljung-Box statistic and report your findings. Finally, plot the first 24 autocorrelations of the residuals to your best model.
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Related Book For
Business Forecasting with Forecast X
ISBN: 978-0073373645
6th edition
Authors: Holton wilson, barry keating, john solutions inc
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