XbarS Chart Template for Excel

Jay Arthur
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Purpose: Evaluate stability of processes using variable data--time, cost, length, weight

The XbarS 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 10 or more), however, you can effectively measure and evaluate the process.

Calculate, plot, and evaluate the standard deviation (S) chart first. If it is "out of control," so is the process. If the S chart looks okay, then calculate, plot, and evaluate the X chart.

The X bar S chart template is actually made up of several templates depending on your needs:

Just click on the appropriate worksheet tab to access any of these options:

• Center Line Based on Average (far left tab)
• Center Line Based on Median
• Templates for Horizontal Data

Other Resources

• X bar S Chart Macro
• X bar S Chart formula
• X bar R chart for samples of 2 to 5

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

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