Many widely used models, including proportional hazards models with un- observed heterogeneity, can be written in the form (Y ) = min[ 0 X + U; C], where is an unknown increasing function, the error term U has unknown distribution function and is independent of X, C is a random censoring...

This paper proposes a semiparametric proportional hazard model for bivariate duration data in the analysis of two-component systems. Examples include the two infection times of the left and the right kidneys of patients and the two retirement times of married couples. As a generalization of the...

This paper examines the effects of individual, household and community characteristics on two aspects of fertility among South African women - the age at first conception and the number of pregnancies. We find that education has a significant effect in pushing back the age at first conception...

It is often argued that a rapid rise in educational attainment of women, an increase in the age at marriage and an increase in the age at first birth are key features of demographic transition in any country. Education is the prime catalyst in this process because increases in educational...

Evidence from most developing countries suggest that parents have a preference for sons over daughters. This is know as son preference. This paper uses individual level unit record data to test the son preference hypothesis in South Africa. We use an accelerated hazard model to estimate the...

Between one and two million migrants reside in cramped conditions in Nairobi’s slums without proper access to sanitation or affordable clean water. Children in such areas are exposed to enormous risks, health risks in particular. Using longitudinal data collected every four months during the...

High drop-out rates and low graduation rates have become an issue of growing interest for higher education institutions and academic authorities. Since 2003, the University of Antioquia started a process of identification of the main factors associated with this phenomenon. This article presents...

In this work we study the effect of several covariates X on a censored response variable T with unknown probability distribution. A semiparametric model is proposed to consider situations where the functional form of the effect of one or more covariates is unknown. We provide its estimation...

A rapid rise in women's education levels, an increase in the age at marriage and an increase in the age at which they have their Þrst child are key features of demographic transition in any country. Education is considered to be an essential component in this process because increases in...

In 2005, the Indian Government launched a conditional cash-incentive program to encourage institutional delivery. This paper studies the effects of the program on neonatal mortality using district-level household survey data. We model mortality using survival analysis, paying special attention...