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  • Thanks for the inputs, really appreciate it. I’ll try to search for Growth Six Sigma…

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  • Yes, count data can be in control – the distribution has nothing to do with whether or not the process is in control. As for control charts – they do not require normal data.

    “The assumption of normally distributed data is introduced into the control chart formulas through the use of the control chart constants. The values for these constants…[Read more]

  • Hi
    Can count data with a poisson distribution be in control ( I thought the only way to test for control was with a control chart and that this required Normal data )

    That data I’m using is about customer refferals. How people do my customers tell about a positive customer experience (direct not on line)

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  • Look at the monthly numbers to be sure a seasonal effect doesn’t seem to be occurring. You can do a chi squared across the past 18 months or 6 quarters to confirm your findings.

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