For the data in Exercise 18.9, determine the centered moving average for N = 2; for N = 4.
Answer to relevant QuestionsAccording to the U.S. Energy Information Administration, a heating degree-day is a relative measurement of outdoor temperature that indicates how far the average daily temperature is below 65° Fahrenheit. The higher the ...For the data of Exercise 18.11, fit an exponentially smoothed curve with smoothing constant α = 0.4; with smoothing constant α = 0.7. Which constant provides more “smoothing” and why? Which curve is quicker to “catch ...Given the degree-day data of Exercise 18.11, (a) determine the monthly seasonal indexes for January through December, then (b) use these indexes to deseasonalize the original time series. In exercise For the data of Exercise 18.7, use the weighting constant α = 0.5 and exponential smoothing to determine the forecast for 2008. In exercise What is the Durbin-Watson test for autocorrelation, and how can it be useful in evaluating the relevance of a given regression model that has been fitted to a set of time series data?
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