X bar R Charts in Excel
Use an X bar R chart to evaluate stability of processes using variable data--time, cost, length, weight.
Here is an example of an X bar R chart (Average and Range Chart) created using QI Macros for Excel
X bar R chart data usually looks like this:
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.
Tip: QI Macros will prompt you for your subgroup size. A subgroup is a group of measurements produced under the same set of conditions. In the example above the subgroup size is five.
Note: The XbarR Chart in QI Macros was developed to support a maximum of 100 columns of data.
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