Control Charts in R: A Guide to X-Bar/R Charts in the qcc Package
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Statistical process control provides a mechanism for measuring, managing, and controlling processes. There are many different flavors of control charts, but if data are readily available, the X-Bar/R approach is often used. The following PDF describes X-Bar/R charts and shows you how to create them in R and interpret the results, and uses the fantastic qcc package that was developed by Luca Scrucca. Please let me know if you find it helpful!
Creating and Interpreting X-Bar/R Charts in R
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