Biases from truncation caused by coresidency restriction have been a challenge for research on intergenerational mobility. Estimates of intergenerational schooling persistence from two data sets show that the intergenerational regression coefficient, the most widely used measure, is severely...

Self-assessed measures of health using Likert-type scales are widely used to assess the health and well-being of populations, and are a feature of household surveys throughout the world. However, the self-reported and subjective nature of these measures means that different people will...

We consider the estimation of the usual Gravity model of trade, which involves flows of trade, say exports, from country i to country j in time period t. We suggest an easy-to-implement generalised method of moments estimator that avoids the issues associated with the usual fixed effects...

Two-step estimation with large panel data sets generally involves estimating vectors of individual-specific coefficients in a first-stage. In a second-stage estimation a vector of estimated coefficients is used as the dependent variable. Potential problems of heteroskedasticity in the second...

Latent class, or finite mixture, modelling has proved a very popular, and relatively easy, way of introducing much-needed heterogeneity into empirical models right across the social sciences. The technique involves (probabilistically) splitting the population into a finite number of (relatively...

Potential biases from coresident sample selection have been a major stumbling block for research on intergenerational mobility in developing countries. We use two rich data sets from Bangladesh and India to provide evidence on the extent of coresidency bias in standard measures of...

Over the past few years, the price of electricity on the European market has decreased significantly and thereby the competitiveness and profitability of the Swiss hydropower firms has deteriorated. With one possibility to improve the sector's competitiveness being an increase in the firms'...

Maize plays a leading role in the food security of millions in southern Africa, yet it is highly vulnerable to the moisture stress brought about by the erratic rainfall patterns that characterize weather systems in the area. Developing and making drought-tolerant maize varieties available to...