D. G. Fiebig

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Activities of the extracellular enzymes beta-glucosidase and phosphatase and bacterial densities were investigated during the filtration process at several sites in a groundwater recharge plant at the Ruhr river (Hengsen recharge plant in Schwerte. Germany). Low numbers of microorganisms and low levels of activity in this type of habitat, compared to most(More)
A Monte Carlo experiment is undertaken to examine the small sample properties of three alternative estimators of a bivariate probit model with selection. The three estimators are the censored probit estimator, single-equation probit applied to the selected sub-sample and single-equation probit applied to the full sample. These estimators are compared in(More)
Discrete choice models often feature a generic outside option that combines all alternatives other than those of particular interest to the researcher, which allows overall demand for the alternatives of interest to be captured. I demonstrate that combining diverse alternatives into a single outside option can result in distorted parameter estimates and(More)
This paper analyzes the gender wage disparities among rural-urban migrants in urban China using a nationally representative data set. On average, female migrants earn only 66% of their male counterparts’ average hourly wage. And the gender wage gap is not uniform across migrants’ wage distribution with differentials much higher at the top end than at the(More)
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