A Pareto Chart is a graph with both bars and a line, where the individual values of a data series are presented in vertical bars (generally in descending order), and the cumulative values are presented as an increasing, concave line. Often, the vertical axis on the left of the chart is used to depict the number of occurrences (or costs, or other metric), while the vertical axis on the right is used to show the percentage of total occurrences.
Pareto charts are often used in quality control, analyzing reasons for why defects are happening or why a process is not working properly. As a matter of fact, they are considered one of the key seven tools of Total Quality Control (TQC). A Pareto chart shows a quick highlight on what the key reasons are for a problem or issues (e.g. addressing the top two issues will help us solve xx% of the total defects).
The chart is named after Vilfredo Pareto (1848 to 1923), an Italian engineer and economist who taught at the University of Lausanne in Switzerland. He was best known for his “Pareto distribution,” stating that the wealth distribution in a society generally follows a power law curve.
The chart is named after Vilfredo Pareto (1848 to 1923), an Italian engineer and economist who taught at the University of Lausanne in Switzerland. He was best known for his “Pareto distribution,” stating that the wealth distribution in a society generally follows a power law curve.
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