Xbar, Rb, and D Charts

Section 6 Charts for Multiple Locations

Lesson S06-03

Text: Section 6 pages 14 – 22

Duration: 15 minutes

Introduction to X̄, Rb, and D Charts

When the differences between locations are not random, that is, one location produces larger values than the other location, we may use a “d” (differences) chart to monitor the consistent difference that is expected between the locations. “d” represents the (largest) “difference” that is expected between the locations.

Chart Using Minitab

Why are the averages close to the center line?

Consider the Source of Variation

Use the 3-way Charts

Download the X̄, Rb, and D Charts Calculations Worksheet. Or view workbook page Section 6: Pages 19 and 20.

Summary

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About Steven Wachs

Steven Wachs has 25 years of wide-ranging industry experience in both technical and management positions. Steve has worked as a statistician at Ford Motor Company where he has extensive experience in the development of statistical models, reliability analysis, designed experimentation, and statistical process control.