The gamma process and the inverse Gaussian process are widely used in condition-based maintenance. Both are suitable for modelling monotonically increasing degradation processes. One challenge for practitioners is determining which of the two processes is most appropriate in light of a real data set. A common practice is to select the one with a larger maximized likelihood. However, due to variations in the data, the maximized likelihood of the “wrong” model could be larger than that of the “right” model. This paper proposes an efficient and broadly applicable test statistic for model selection. The construction of the test statistic is based on the Fisher information. Extensive numerical study is conducted to indicate the conditions under which the gamma process can be well approximated by the inverse Gaussian process, or the other way around.
|Title of host publication||Risk, Reliability and Safety|
|Subtitle of host publication||Innovating Theory and Practice: Proceedings of ESREL 2016 (Glasgow, Scotland, 25-29 September 2016)|
|Editors||Lesley Walls, Matthew Revie, Time Bedford|
|Place of Publication||London, UK|
|Number of pages||6|
|Publication status||Published - 13 Sep 2016|
- gamma process
- Gaussian process
- condition-based maintenance
- degradation processes
- Fisher information matrix
Zhang, M., & Revie, M. (2016). Model selection with application to gamma process and inverse Gaussian process. In L. Walls, M. Revie, & T. Bedford (Eds.), Risk, Reliability and Safety: Innovating Theory and Practice: Proceedings of ESREL 2016 (Glasgow, Scotland, 25-29 September 2016) London, UK.