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Pareto¶
Identify which categories contribute most to a problem so you can focus improvement efforts where they matter most.
What is a Pareto Chart?¶
A Pareto chart combines a bar chart with a cumulative line to show the relative importance of different categories. The bars are arranged in descending order of frequency or magnitude, making it easy to see which categories have the biggest impact.
The chart is based on the Pareto Principle (also called the 80/20 rule), which suggests that roughly 80% of effects come from 20% of causes. In quality improvement, this means a few defect types often account for most of the problems.
When to Use a Pareto Chart¶
- When you have categorical data and want to know which categories occur most frequently
- When you need to prioritize improvement efforts by identifying the "vital few" causes
- When you want to show stakeholders where to focus resources for maximum impact
- When comparing before/after data to verify that improvements addressed the right issues
Example Output¶
A typical Pareto chart shows defect types as bars (sorted from most to least frequent) with a cumulative percentage line showing how quickly categories add up to 100%.
Negative Values in Pareto Analysis
Traditional Pareto charts are designed for non-negative data such as counts or costs. Quantum XL extends this capability by allowing negative values in continuous frequency analysis, enabling more comprehensive financial analysis where returns, refunds, or adjustments need to be factored into category rankings.
Learn More¶
- Examples — Step-by-step tutorials for different scenarios
- Preparing Your Data — Data types, layouts, and the behavior matrix
- Options — All chart settings and customization options