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Control charts

Hi, I would like to know if in order to make a Xbar-R chart, my data has to be normally distributed?

Advanced Statistical Modeling

Quality and Process Engineering

Re: Control charts

Hi @cesarpc98 ,

Your data does not need to be normally distributed to use an Xbar-R chart. An important concept to address with this sort of chart is how you are subgrouping your data, referred to as rational subgrouping.

If you'd like to learn more about subgrouping and normality then you can check out the Quality Methods module of JMP's free Statistical Thinking for Industrial Problem Solving course. There are also quite a few posts to peruse on these topics in the JMP User Community in case you'd like to benefit from your predecessor's questions.