The evolution of different life history strategies and thus different ageing patterns essentially depends on the nature of the underlying trade-offs between survival and reproduction. To fully comprehend ageing, we need to understand these trade-offs.

This paper aims at contributing to a proposal for the concept and content of the Contextual Database of the Generations and Gender Program. We develop guidelines for data collection by identifying the main focus, the key dimensions as well as the main data types of the GGP Contextual Database....

The increasing recognition that the study of human behaviors has to take into account the multiple contexts in which they occur has opened a promising research avenue in social sciences. It also presents new challenges, e.g., to complement micro-level surveys with the collection of meaningful...

This paper outlines the concept and content of the Contextual Database of the international Generations and Gender Program and gives an overview of the context of demographic behavior in Bulgaria. The Contextual Database provides an instrument that together with the Generations and Gender Survey...

In this paper we study the changes of reproduction concentration among women, the levels of childlessness, individual factors influencing childlessness, and the contribution of childlessness to the concentration of reproduction in Austria for the female age cohorts 1917-1961. International...

This paper documents the source code of “LifeCourse”, a simple competing risk microsimulation model initially developed alongside a study on fertility decline in Bulgaria and Russia. “LifeCourse” is programmed in the generic microsimulation language Modgen developed at Statistics Canada....

In this paper, we explore the relation between sample sizes of female respondents aged 18-44 and the statistical significance of parameter estimates in four piecewise constant proportional hazard regression models by means of microsimulation. The underlying models for first marriage, first...

Following the collapse of the communist regimes in Bulgaria and Russia, the two countries have experienced dramatic fertility decline. The aim of this paper is to examine the individual contribution of various factors that have contributed to the overall drop in first and second births. By means...

-

Hamilton quantified the force of selection on an age-specific mutation. Hamilton’s indicators of the age-specific force of selection always decline with age. This result is of profound importance to the theory of the evolution of senescence. Here I derive alternative indicators within...