Show current evolution against expected historical variability and add one or more series that could account for the difference.
Displaying expected versus actual values is a common task in data visualization, and multiple levels of detail and complexity can be used. The chart below lets you compare a reference line to current data and see how they change over time. It includes several subtasks, like displaying expected variability, absolute differences and the data for a major component of that difference.
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About the Author
Jorge Camoes is a data visualization consultant based in Lisbon. Author of the book Data at Work. Runs ExcelCharts.com, where he discusses how to use Excel as data visualization tool. Recently playing with PowerBI & PowerQuery.