
Broom” charts are reliability function estimates from different or successive production cohorts. Their differences may contain actionable information. How to quantify and use that information? This article provides an alternative to traditional Duane, AMSAA, and Crow reliability growth models, based on Cox’ proportional hazards model for test or field reliability data. This article provides:
- Broom charts that show reliability growth or deterioration
- Reliability growth references, including credit to my UC Berkeley professors
- Proportional hazards (PH) model(s) of reliability growth with vs. without lifetime data
- Suggestions for what to do about reliability deterioration
Suppose successive test samples or production cohorts have reliability growth or deterioration, caused by TAAF (Test, Analyze And Fix), configuration, environment, stress, or vendor changes, or ??? Suppose product cohorts have “proportional hazard” functions.
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