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by Fred Schenkelberg 5 Comments

Field Data Analysis First Look

Field Data Analysis First Look

What Can Field Failure Data Reveal?

Field data analysis starts with the collection of data.

In a previous article, we used a Nevada chart to gather the counts per month of field failure data. The chart also provides the necessary data to account for how many units have not failed as of yet.

The Nevada chart on its own is just a table of numbers and does not reveal patterns of the changing nature of failure rates over time. Are we experiencing early life failures or wear out related failures?

We need to conduct some data analysis to learn what message the data contains. [Read more…]

Filed Under: Articles, Musings on Reliability and Maintenance Topics Tagged With: data analysis, Failure, plot, weibull, Weibull Distribution

by Fred Schenkelberg 2 Comments

Reading CDF Plots

Reading CDF Plots

First the Question:

Fred,
Early in the FMEA lecture you worked through a homework problem and you mentioned that a cdf may not be linear (hence the reason for giving three points in a reliability goal).  Can you give an example of two of things you’ve seen with non-linear cdf’s?  I’ve only done limited reliability testing at this point, but everything I’ve done and every example I’ve ever seen have had linear cdf’s.
Thanks,
John

And, my response: [Read more…]

Filed Under: Articles, CRE Preparation Notes, II. Probability and Statistics for Reliability, VII. Data Collection and Use Tagged With: CDF, cumulative distribution function, plot

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