Summarizing and Aggregating Data

Abstract

In this chapter we’ll introduce recipes for working with your data at a higher level, where grouping, summaries, and the bigger picture are important. Many of the recipes we’ll explore cover common or tricky reporting scenarios, the kind you encounter in a business or professional setting. Most organizations ask for reports about who sold what to whom, how many people, sales, or activities happened in a given time frame, trends across regions or customer groups, and the like.