Chapter 64 Using moving averages to understand time series
Question answered in this chapter:
I’m trying to analyze the upward trend in quarterly revenues of Amazon.com since 1996. Fourth-quarter sales in the United States are usually larger (because of Christmas) 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?
Answers to this chapter’s question
Time-series data simply displays the same quantity measured at different points in time. For example, the data in the file Amazon.com.xlsx, a subset of which is shown in Figure 64-1, displays the time series for quarterly revenues in millions of dollars for Amazon.com. ...
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