Chapter 50. Using Moving Averages to Understand Time Series
Iâm trying to analyze the upward trend in quarterly revenues of toy sales since 1993. Fourth quarter sales are always larger (because of the Christmas holidays) than sales during the first quarter of the following year. This pattern obscures the upward trend in sales. Is there any way that I can graphically show the upward trend in revenues?
Time series data simply displays the same quantity measured at different points in time. For example, the worksheet named Data and Chart in the file Toysrusma.xls, shown in Figure 50-1, displays the time series for quarterly revenues in thousands of dollars. Our data covers the time interval from the first quarter of 1993 through the fourth quarter ...
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