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Most companies maintain warranty databases for purposes of financial reporting and warranty expense forecasting. In some cases, there are attempts to extract engineering information (e.g., on the reliability of components) from such databases. Another important application is to use warranty data to detect potentially serious field reliability problems as(More)
This paper evaluates exact coverage probabilities of approximate prediction intervals for the number of failures that will be observed in a future inspection of a sample of units, based only on the results of the rst in-service inspection of the sample. The failure-time of such units is modeled with a Weibull distribution having a given shape parameter(More)
This paper compares diierent procedures to compute conndence intervals for parameters and quantiles of the Weibull, lognormal, and similar log-location-scale distributions from Type I censored data that typically arise from life test experiments. The procedures can be classiied into three groups. The rst group contains procedures based on the commonly-used(More)
Modern technological developments such as smart chips, sensors and wireless networks , have changed many data collection processes. For example, there are more and more products being produced with automatic data-collecting devices that track how and under which environments the products are being used. While there is a tremendous amount of dynamic data(More)
Accelerated Destructive Degradation Tests (ADDTs) provide timely product reliability information in practical applications. This paper describes Bayesian methods for ADDT planning under a class of nonlinear degradation models with one accelerating variable. We use a Bayesian criterion based on the estimation precision of a specified failure-time(More)
Accelerated life tests (ALTs) provide timely assessments of the reliability of materials, components, and subsystems. ALTs can be run at any of these levels or at the full-system level. Sometimes ALTs generate multiple failure modes. A frequently asked question, coming near to the end of an ALT program, is " What do these test results say about field(More)