COVID-19 Data: Does a Control Chart Add Anything to the Analysis?

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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 (2)

  • Julian DuncanJune 3, 2020 Reply

    Thank you for all these interesting insights into control charts – I look forward to each monthly installment.For this sort of data – the US covid death rate for example – it always surprises me that you do not mention cusum analysis.  The breakpoints, change of slope in the data, are really clearly visible; much more so than in a semi-log plot and the means, probabilities of a change and the variability within each range are easily calculated.I'm long retired but for many years as a QC manager, cusum coupled with Shewhart analysis served me well in monitoring the factory and getting to the root of problems.  It would be very interesting to read your view on cusum in one of these monthly educational documents.

    • billJune 3, 2020 Reply

      Thanks for your kind comments.   I usually stay away from CUSUM because it doesn't plot the actual data.  Have you do a CUSUM chart?  If so, I would like to see what you have done.  [email protected]

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