Interval Estimation for Censored Accelerated Life Tests Based on the Lognormal Model

Article

Schneider, Helmut; Weissfeld, Lisa   (1989, ASQC)   Louisiana State University; University of Michigan

Journal of Quality Technology    Vol. 21    No. 1
QICID: 5630    January 1989    pp. 24-31
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Article Abstract

Simulation studies in this paper indicate that the standard large sample confidence intervals applied to censored samples from accelerated life tests tend to be too short for the required confidence level. Alternative confidence limits are derived which are asymptotically equivalent to the standard large sample confidence limits. These new confidence limits are asymmetric for finite-sized samples and produce a more accurate upper confidence limit. If the main point of an investigation is to determine whether the median or percentile lifetime is below a certain value, a one-sided confidence bound can be use and the proposed technique will yield more accurate results.

Keywords

Sampling,Censored data,Interval estimation,Lognormal distribution,Normal distribution


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