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EN
In this paper, we are interested in determining a maintenance policy with an optimal cost to enable the company to generate significant profits, often the means of transport travelled different paths, they are characterized by the distance they covered; however each distance has an effect on the operating characteristics of means of delivery. The objective of this paper is twofold: It aims both to introduce the model of supply chain and specify distances, and codify the use of it in the proportional hazard model, later a maintenance policy was presented which takes into consideration the types of paths travelled by the means of delivery.
EN
The goal of this study is to find covariates impacting most profoundly on the risk of death. Individuals aged 50 and more, observed in the Survey on Health, Ageing and Retirement in Europe, are examined. The data include 1,692 deceased individuals who took part in up to 3 waves of data collection. Our results, relying on the proportional hazard model, show that the impact of health and demographic factors on the risk of death is more pronounced than that of social factors. It is found that economic factors are statistically insignificant for the risk of death, checking other factors in the model.
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