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Book Overview & Buying
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Table Of Contents
Data Analysis Using SQL and Excel - Second Edition
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Along with geography, time is a critical dimension describing customers and businesses. This chapter introduces dates and times as tools for understanding customers. This is a broad topic. The next two chapters extend these ideas by introducing survival analysis, the branch of statistics also known as time-to-event analysis.
This chapter approaches time from several different vantage points. One perspective is the values that represent dates and times, the years, months, days, hours, and minutes. Another is when things happen, along with ways to visualize changes over time and year-over-year comparisons. Yet another perspective is duration, the difference between two dates, and even how durations change over time.
The two datasets used for examples—purchases and subscribers—have date stamps accurate to the day, rather than time stamps accurate to the minute, second, or fraction of a second. This is not an accident. For many business...
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