ENBIS-16 in Sheffield

11 – 15 September 2016; Sheffield Abstract submission: 20 March – 4 July 2016

The Effect of Miss-Specified Suspensions in Lifetime Prediction with Heavily Censored Data

13 September 2016, 14:30 – 14:50

Abstract

Submitted by
Nikolaus Haselgruber
Authors
Nikolaus Haselgruber (CIS Consulting in Industrial Statistics GmbH)
Abstract
To provide point and interval estimates for lifetime problems, a representative random sample with lifetime observations is required. In frequent applications, at the point of analysis only a part of the individual sample items has reached end of life while the rest are suspended items, i.e., they are still alive at that time. If the lifetime information of the sample is taken from a warranty database, usually complete information about failed items is available while from the suspended items only the start time is known. In cases where the lifetime is not measured in absolute calendar time but, e.g., in operation time for industrial equipment or mileage for some vehicle components, the age of the suspended items at the point of analysis has to be estimated.
This presentation shows the effect on miss-specified suspensions on the result based on simulated data and discusses possibilities to avoid this problem.
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