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What’s A X-Bar & R Chart?

X-Bar & R Charts are Control Charts designed for tracking the average of sub-grouped continuous data. They consist of two separate charts;  “X-Bar” stands for the “Average” Chart which tracks the mean of sub-groups of up to 6 data points and “R” stands for “Range” Chart which tracks the difference between the maximum and minimum values in the subgroup. These charts are not as sensitive to non-normal data as the I & MR Charts.

A classic example of an X-Bar & R Chart is to track the average cycle time to deliver packages by sampling 5 packages per day.

Learn more about X-Bar & R Charts in Control Phase, Module 6.2.2 of Black Belt Training.

How To Run A X-Bar & R Chart In SigmaXL

Download the GoLeanSixSigma.com X-Bar & R Chart Data Set for SigmaXL here.

1. Highlight the Raw Data:

XBar&RChart-SigmaXL-RawData

2. SigmaXL > Control Charts > X-Bar & R:

XBar&RChart-SigmaXL-SelectData

3. Click “Next>>>”:

XBar&RChart-SigmaXL-Settings

XBar&RChart-SigmaXL-ChartTitle

4. Select “Bottle 1, Bottle 2 and Bottle 3” as Numeric Data Variables (Y)

5. Select “Tests for Special Causes”

6. Select “Sigma Zone Lines”

7. Add a Title

8. Click “OK>>”:

XBar&RChart-SigmaXL

To learn more about X-Bar & R Charts, register for Black Belt Training and review Control Phase, Module 6.2.2.