Probability of violating SPC rules by chance
- March 19, 2009 at 7:49 pm #52064
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Has anyone ever seen a list of the probabilities that a normal system will violate any of the standard SPC rules by chance? For instance, I know that if a system is stable and normally distributed and my control limits are based on +/- 3 standard deviations that I will have points outside of my control limit 0.27% of the time. What is the probability that I would get 7 consecutive points going up or down? And how would the probability be affected if I changed the number of consecutive points to 5 as you can in some software packages now?0March 19, 2009 at 7:52 pm #182534
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