Tag Archives: SPC

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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