Tag Archives: SPC

Conclusion of In Electronics Manufacturing, Does Cpk =1 Yield 66,800 DPM?

Patty, Rob, and Pete were quite sure they understood the confusion in the Cpk = 1 issue, but wanted to make sure they discussed it with the Professor.  After a brief chat with him, they called ACME CEO Mike Madigan … Continue reading

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The False Positive Paradox

Folks, Let’s check in on Patty… Patty was intensely preparing a lecture on Bayes’ Theorem. She always felt that this theorem was the most profound in probability and statistics. She remembered a real application, when her best friend took the … Continue reading

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Weibull Analysis of Solder Joint Failure Data II

Folks, Last time we introduced Weibull analysis. Let’s derive the relationships needed to calculate the slope, beta, and characteristic life, eta.   F(t) is the cumulative fraction of fails, from 0 to 1. By choosing Ln(t) as x and LnLn … Continue reading

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An SPC Rx

It was Wednesday evening and I had just finished a brief pitch on applications of SPC to a group of 20. I was followed by Jim Hall, who spoke of process mapping using SIPOC.  So did these folks have solder paste under … Continue reading

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