What is the fine-grained topic of the following text: In this paper, we use a statistical approach to estimate MRL and consider a Weibull proportional hazard model (PHM) with time-independent covariates to model the hazard function so that the operating environment could be integrated into the reliability analysis. Only return the topic.
Estimating Mean Residual Life (MRL) using a Weibull Proportional Hazard Model (PHM) with time-independent covariates for reliability analysis.