A while ago, Sharon came to me asking a question regarding Pareto Chart Multiples. That is, per each category, there is a Pareto chart. And we need to create Pareto charts for all the categories. This chart allows us to quickly view the few most important factors that matter to the majority of output in each category. 

Vilfredo Pareto (1848-1923) is the father of the 80/20 rule: 80% of output are produced by 20% of input. It works magically well through all the years. Using the Superstore data, I found that the top 23% of products accounts for 80% of sales as shown below.

The vertical axis is based on the cumulative sum of sales over the total sales, computing along the product dimension which is sorted by sales.
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