SPC and Jeopardy

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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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  • AnonymousDecember 29, 2012 Reply

    Thanks.   You have SPC for Excel competition globally, and I have tested some of these VB efforts.   What most of them miss is the offline SPC support tools needed to characterize the process and test out the rule options and limits options before moving to production mode.With automatic tools and gages, and mix of products, multiple tools or chambers per product step, and multiple product attributes that need monitoring, these support tools are important.As you know, my world is data rich, and most of our charts are economically set up based on cost of bad quality vs cost of measurement plus cost of adjustment or fix if OOC, so we have custom rules, and often custom limits methods based on violation of Shewhart assumptions, especially "Independent Data" assumption (autocorrelation issues) and irrational subgrouping…designed for feedback rather than for classical alarming. But I see less and less Xbar-R or Xbar-S charts used these days, and more Individuals charts with separate boxplot trend charts for the raw data viewing when main chart alarms.

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