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Jack_Tang
Jack_Tang
Level I

Attachment is failure rate for one material from different lot which was built in different timeframe, how to use JMP to predict the long term upbound failure rate?

Jul 4, 2023 09:22 AM (813 views)
 
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dale_lehman
dale_lehman
Level VII

Re: Attachment is failure rate for one material from different lot which was built in different timeframe, how to use JMP to predict the long term upbound failure rate?

Jul 5, 2023 09:07 AM (794 views)  |  Posted in reply to message from Jack_Tang 07-04-2023

Can you provide some more detail?  Are the lots in chronological order (time series) or are they just sorted from high to low failure rates?  I suspect it is the former in which case you can try to fit time series models to this data.  On the other hand, just a graphical exploration may be sufficient.  I find that a simple power function fits this data quite well (failure rate = 57813*time^-0.668).  Graphically, assuming this is a time series, the failure rate appears to be stabilizing and the long-run prediction from that power function might be appropriate - but I'd need more information to know if that makes any sense).

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