Bongaarts and Feeney (1998) have recently proposed an adjusted total fertility rate to disentangle tempo effects from changes in the quantum of fertility. We propose an extension to the Bongaarts and Feeney formula that includes variance effects, i.e., changes in the variance of the fertility...

In this paper we establish the asymptotic distribution of DeFries-Fulker (1985) regression estimates for heritability and shared environmental influences with double-entry twin data. A simple formula to estimate the covariance matrix of the coefficients in DF-regressions is provided, and...

Demographers have increasingly argued that social interaction is an important mechanism for understanding fertility behavior. Yet, substantial uncertainty exists whether ´social learning´ or ´social influence´ constitutes the dominant mechanism through which social networks affect...

Der Bezug von Erwerbsminderungsrente ist ein unterschätztes Risiko - es trifft in Deutschland mit mehr als jedem fünften Arbeitnehmer mehr Menschen als man denkt. Die empirischen Befunde, die auf verschiedenen Analyseebenen ansetzen, verdeutlichen: Im sechsten Lebensjahrzehnt ist das Risiko...

Descriptions and analyses of citizens' or households' income have a long tradition in economics. A large body of research has recognized that levels of income and how income is distributed are important contributors to the wealth of nations. Within the broader context of income and its...