Four-period centered moving averages

Reference no: EM13995485

1. Given the time series in Exercise 18.65, and using exponential smoothing with a 5 0.5, what would have been the forecast for 2009?

2. Construct three-period and four-period centered moving averages for the quarterly J. C. Penney sales in Exercise 18.67. Are there any other retailing companies for whom a four-period moving average might have such a great effect on smoothing quarterly sales data? If so, give a real or hypothetical example of such a company.

3. The following data describe quarterly residential natural gas sales from 2005 through 2008. Determine the quarterly seasonal indexes, then use these indexes to deseasonalize the original data. Source: U.S. Energy Information Administration, eia.doe.gov, August 22, 2009.

Residential Gas Sales (Trillions of Cubic Feet)

	I	II	III	IV
2005	2329	784	353	1360
2006	2042	700	349	1277
2007	2317	761	346	1294
2008	2351	762	345	1408

Reference no: EM13995485

Questions Cloud

Calculate the mean absolute deviation : Construct a first- order autoregressive forecasting equation for these data, calculate the mean absolute deviation (MAD) for the fit of the forecast values to the actual values, then use the equa- tion to forecast the PPI for 2008. Source: Bureau o..

Calculate the change in internal energy of the system : Calculate the change in internal (thermal) energy of the system. If the internal (thermal) energy change is nonzero. be sure to indicate whether this energy change is positive or negative.

Linear trend equation and forecast the number : a. Combining the quarterly bookings for each year, fit a linear trend equation and forecast the number of bookings for 2013. b. Determine the seasonal indexes and break the 2013 forecast in part (a) into its quarterly components.

Annual unit sales of a filtering system component : The trend equation yˆ 5 150 1 12x 1 0.01x2 has been developed for annual unit sales of a filtering system component used by municipal water authorities. The years have been coded so that 2001 corresponds to x 5 1. If the seasonal indexes for quart..

Four-period centered moving averages : Construct three-period and four-period centered moving averages for the quarterly J. C. Penney sales in Exercise 18.67. Are there any other retailing companies for whom a four-period moving average might have such a great effect on smoothing quart..

Smoothness of the ?tted curve : Using the constant a 5 0.3, ?t an exponentially smoothed curve to the original time series. Repeat part (c) using a 5 0.7. How has the new value for the constant affected the smoothness of the ?tted curve?

Smoothing and the smoothing constant : The U.S. trade deficit with Canada (billions of dollars) from 2000 through 2007 is reported as shown in the table. Using exponential smoothing and the smoothing constant a = 0.7, what deficit would have been forecast for 2008? Source: World Almanac..

Conduct research to identify a company that operates : Conduct research to identify a company that operates in two countries located in two different geographical regions. After evaluating the assigned readings and the research literature related to this module

Calculate the electric potential energy of charge : Two point charges, q1= +4uC and q2=+5uC are fixed in position on the x-axis with q1 at the origin and q2=10cm. Setting the potential energy to zero at infinity, calculate the electric potential energy of charge 2.

User Account

All Pages