XmR Control Chart in Excel

Use an XmR Chart to Evaluate Stability of Processes Using Variable Data

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Here is an example of an XmR chart created using QI Macros for Excel.

individual moving range XmR chart

XmR chart data usually looks like this:

x mr chart data example

The XmR chart can help you evaluate a process when there is only one sample and they are farther apart: monthly postage expense, time to write a computer program, and so on.

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.

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