TY - GEN
T1 - Analyzing ALT Data with Time-varying Stress Profile
AU - Pan, Rong
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - We are interested in analyzing the accelerated life testing data obtained under time-varying stresses. This is a generalization of step-stress accelerated life test, where the stress levels are kept constant at each step. Our study shows that the time-dependent proportional hazard model, commonly appeared in the survival data analysis literature, is not applicable for ALTs, because this approach does not take accounts of the cumulative damage that the stress profile exerts on test units. Instead, we assume that products possess constant failure rates over small time intervals, and the change of failure rate by the stress variable still have the proportional hazard property. With these assumptions, it is possible to formulate the data according to a generalized linear model and statistical inferences on model parameters can be carried out. We demonstrate our models and inference procedures by using both synthetic and real datasets.
AB - We are interested in analyzing the accelerated life testing data obtained under time-varying stresses. This is a generalization of step-stress accelerated life test, where the stress levels are kept constant at each step. Our study shows that the time-dependent proportional hazard model, commonly appeared in the survival data analysis literature, is not applicable for ALTs, because this approach does not take accounts of the cumulative damage that the stress profile exerts on test units. Instead, we assume that products possess constant failure rates over small time intervals, and the change of failure rate by the stress variable still have the proportional hazard property. With these assumptions, it is possible to formulate the data according to a generalized linear model and statistical inferences on model parameters can be carried out. We demonstrate our models and inference procedures by using both synthetic and real datasets.
KW - accelerated life test
KW - Poisson regression
KW - proportional hazard
KW - reliability prediction
KW - stress profile
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U2 - 10.1109/RAMS51457.2022.9893949
DO - 10.1109/RAMS51457.2022.9893949
M3 - Conference contribution
AN - SCOPUS:85139002667
T3 - Proceedings - Annual Reliability and Maintainability Symposium
BT - 68th Annual Reliability and Maintainability Symposium, RAMS 2022
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 68th Annual Reliability and Maintainability Symposium, RAMS 2022
Y2 - 24 January 2022 through 27 January 2022
ER -