Design-based estimators of totals, means or proportions in finite populations generally are functions of weighted sums. If each element selected into the sample is also observed, then for the calculation of the pi-estimator these weights are just the inverse inclusion probabilities of the...

Environmental employment is an issue with high interest to the public and to policy makers. Yet, the debate is blurred by a great number of distinct definitions and hence estimates of environmental employment. Therefore it is essential to carefully document delimitations and methods used in any...