X bar R Charts in Excel

Jay Arthur
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Use an X bar R chart to evaluate stability of processes using variable data--time, cost, length, weight.

Here is an example of a X bar and R chart created using the QI Macros SPC Software for Excel.

X bar Chart

Average

Range Chart
Range

The XbarR chart can help you evaluate the cycle time for almost any process: making a widget, answering a customer call, seating a customer, delivering a pizza, or servicing an appliance. This chart is especially useful when you do this many times a day. Collecting the data could be expensive if you measured every time you did it. Using a small sample (typically two to five), however, you can effectively measure and evaluate the process.

Calculate, plot, and evaluate the range chart first. If it is "out of control," so is the process. If the range chart looks okay, then calculate, plot, and evaluate the X chart.

Other Resources

• X bar R chart template
• Video showing how to create an X bar R chart in Excel
• X bar R chart formula
• X median R chart

The XbarR chart is just one of the tools included in the QI Macros for Excel SPC Software for Excel.

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