Control Charts, ANOVA, and Variation

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Thanks so much for reading our publication. We hope you find it informative and useful. Happy charting and may the data always support your position.


Dr. Bill McNeese
BPI Consulting, LLC

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Comments (4)

  • Jim HeatonJanuary 1, 2018 Reply

    How did you decide the range charts were in-control? AD? Like you said…very few groups.ThanksJim

    • billJanuary 2, 2018 Reply

      The range chart is in control because there are no points beyond the upper control limit and no patterns (like a long run above or below the average).

  • Venx CHENJanuary 6, 2021 Reply

    Hello Bill,why times 2 of σ2S(B) in below equation? should times 4 when calculate EMS for B like EMS for B = σ2+2σ2S(B)+4σ2(B) ?EMS for S(B) = σ2+2σ2S(B)Thank youVenx

    • billJanuary 6, 2021 Reply

      Hello, it is not clear to be me what equation you are asking about.  RUns together in the comment.  Maybe email me: [email protected]

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