Control Chart Constants: What Are They? How Are They Useful?
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Here are good blog posts and video that explain d2 and d3 using simulation:
https://andrewmilivojevich.com/d2-constant-d3-constant/
https://andrewmilivojevich.com/range-statistics/
As far as practical use, it means that your control charts will have statistically valid control limits, so you can properly distinguish between “in-control” and “out-of-control”.
Disclaimer: I’m not affiliated with the blogger or Minitab
Control charts are utilized to analyze an existing process in two ways. First, to see if the data is normally distributed and doesn’t show abnormal trends or spikes. Second, to see if the process has been stable over time. Process Capability can not be accurately calculated without these two attributes. They are also useful to track performance before, during and after a project to see step-change created due to project activity.
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