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Summarizing Data

It seems that as often as we sort data, we summarize data. For example, my monthly mobile phone bill lists the total number of phone calls that I made and the total number of airtime minutes that I used. These data values are also subtotaled by daytime, nighttime, and weekend airtime minutes. As another example, the daily stock report usually provides the opening, closing, highest, and lowest price of various financial markets, among other summary values.

From a business point of view, summarizing data reduces the amount of detailed data you need to review. This allows you to


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