An impact of environment on mortality, similar to survival analysis, is often modeled by the proportional hazards model, which assumes the corresponding comparison with a baseline environment. This model describes the memory-less property, when the mortality rate at a given instant of time...

A system subject to a point process of shocks is considered. Shocks occur in accordance with a nonhomogeneous Poisson process. Different criterions of system failures are discussed in a homogeneous case. Two natural settings are analyzed. Heterogeneity is modeled by an unobserved univariate...

In this paper we investigate (1) the mutual causal relationship between first union formation and first childbirth, and (2) the existence of constant common determinants of these two events. It is argued that (unmeasured) common factors reflect differentials among the population in value...

In 1989, after a long period of socialist rule, Mongolia initiated a democratisation process of its political system together with a transition towards a market economy. This paper examines how changes in socio-economic conditions in Mongolia have affected fertility patterns in recent times. It...

Some stochastic approaches to biological aging modeling are studied. We assume that an organism acquires a random resource at birth. Death occurs when the accumulated dam-age (wear) exceeds this initial value, modeled by the discrete or continuous random vari-ables. Another source of death of an...

Mixtures of increasing failure rate distributions (IFR) can decrease at least in some intervals of time. Usually this property can be observed asymptotically as time tends to infinity. This is due to the fact that the mixture failure rate is ‘bent down’ compared with the corresponding...

If aging is understood as some process of damage accumulation, it does not necessarily lead to increasing mortality rates. Within the framework of a suggested generalization of the Strehler-Mildwan (1960) model, we show that even for models with monotonically increasing degradation, the...

We use three waves of the European Community Household Panel (ECHP) to analyse the impact of employment, earnings, household income, and welfare on young adults’ decision to leave the parental home. In particular we investigate the importance of these income sources in different welfare...

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We study the link between institutional arrangements and fertility, focusing on how institutions affect the nexus between partnership formation and fertility. We apply simultaneous hazard models to family and fertility survey data for Germany and Sweden. Our results show a significant presence...