Weighted Pareto Charts to Demonstrate the Cost of Defects

How to Create a Weighted Pareto Chart

  1. To create a weighted Pareto chart, you will need to calculate the weighted cost of defects. Just multiply the number of defects times the cost per defect to develop a weighted cost. In this example, we calculated the weighted cost (column D) by multiplying columns B and C.

    weighted pareto chart data
  2. To create a Pareto Chart using QI Macros, just select the data (Use "Ctrl C" to select non-adjacent columns):

    select data
  3. Then click on QI Macros menu and select Pareto Chart:

    pareto on menu
  4. QI Macros does all of the math and draws the Pareto in seconds.

    weighted pareto
  5. Compare the weighted chart to the unweighted chart below. The weighted Pareto points to Location 6 as the most costly defect category. While the unweighted Pareto chart below, points to Location 8 as having the most defects.

    unweighted pareto

I really like the QI Macros. The Pareto chart is worth the purchase price of the whole deal.

Mike Dean, Ellwood Texas Forge

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