title: Experimental designs for environmental valuation with choice-experiments: A Monte Carlo investigation

authors: Ferrini, Silvia

subjects: logit experimental design

abstract: We review the practice of experimental design in the environmental economics literature concerned with choice experiments. We then contrast this with advances in the field of experimental design and present a comparison of statistical efficiency across four different experimental designs evaluated by Monte Carlo experiments. Two different situations are envisaged. First, a correct a priori knowledge of the multinomial logit specification used to derive the design and then an incorrect one. The data generating process is based on estimates from data of a real choice experiment with which preference for rural landscape attributes were studied. Results indicate the D-optimal designs are promising, especially those based on Bayesian algorithms with informative prior. However, if good a priori information is lacking, and if there is strong uncertainty about the real data generating process - conditions which are quite common in environmental valuation - then practitioners might be better off with conventional fractional designs from linear models. Under misspecification, a design of this type produces less biased estimates than its competitors.

text: Experimental designs for environmental valuation with choice-experiments: A Monte Carlo investigation We review the practice of experimental design in the environmental economics literature concerned with choice experiments. We then contrast this with advances in the field of experimental design and present a comparison of statistical efficiency across four different experimental designs evaluated by Monte Carlo experiments. Two different situations are envisaged. First, a correct a priori knowledge of the multinomial logit specification used to derive the design and then an incorrect one. The data generating process is based on estimates from data of a real choice experiment with which preference for rural landscape attributes were studied. Results indicate the D-optimal designs are promising, especially those based on Bayesian algorithms with informative prior. However, if good a priori information is lacking, and if there is strong uncertainty about the real data generating process - conditions which are quite common in environmental valuation - then practitioners might be better off with conventional fractional designs from linear models. Under misspecification, a design of this type produces less biased estimates than its competitors.

year: 2005-12

title: Health and place in historical perspective: medicine, ethnicity, and colonial identities

authors: Coleborne, Catharine

abstract: Introduction to special issue. This Special Issue includes articles ﬁrst presented as papers at a two-day symposium held at the University of Waikato, New Zealand, in February 2011. The event was designed to highlight a large Royal Society of New Zealand Marsden-funded research project, and to showcase current scholarly work in the ﬁeld of the colonial and postcolonial histories of medicine, with a focus on histories of insanity. We also included the themes of medical migration in New Zealand’s national history, the movement of medical ideas and personnel across empire, a close study of the uses of the term ‘neurasthenia’ in French-colonial Vietnam, and the relationship between place, plants, and health across South Asia and Australia in the nineteenth century.

text: Health and place in historical perspective: medicine, ethnicity, and colonial identities Introduction to special issue. This Special Issue includes articles ﬁrst presented as papers at a two-day symposium held at the University of Waikato, New Zealand, in February 2011. The event was designed to highlight a large Royal Society of New Zealand Marsden-funded research project, and to showcase current scholarly work in the ﬁeld of the colonial and postcolonial histories of medicine, with a focus on histories of insanity. We also included the themes of medical migration in New Zealand’s national history, the movement of medical ideas and personnel across empire, a close study of the uses of the term ‘neurasthenia’ in French-colonial Vietnam, and the relationship between place, plants, and health across South Asia and Australia in the nineteenth century.

year: 2012

title: Spot sampling of nutrient concentrations in the Puarenga catchment, Rotorua

authors: Abell, Jonathan Michael

subjects: New Zealand

abstract: The Centre for Biodiversity and Ecology Research was approached by Tūhourangi Tribal Authority for assistance with measuring water quality in streams in the Puarenga Stream catchment. Water sampling was subsequently undertaken on 18 July 2011 and samples were analysed to determine concentrations of total and dissolved fractions of nitrogen and phosphorus. 
Nitrogen and phosphorus are both essential plant nutrients which, when present in excess, can cause eutrophication and associated water quality decline of freshwaters. High concentrations of dissolved forms of nitrogen can also be toxic to aquatic organisms. Excessive nitrogen and phosphorus concentrations are typically the result of pollution due to human activities, although groundwater in the Central Volcanic Plateau region can have elevated concentrations of phosphorus arising from natural geological sources.
This report summarises the methods used, presents the results and places measured concentrations in context by drawing comparisons with both guideline and regional mean values.

text: Spot sampling of nutrient concentrations in the Puarenga catchment, Rotorua The Centre for Biodiversity and Ecology Research was approached by Tūhourangi Tribal Authority for assistance with measuring water quality in streams in the Puarenga Stream catchment. Water sampling was subsequently undertaken on 18 July 2011 and samples were analysed to determine concentrations of total and dissolved fractions of nitrogen and phosphorus. 
Nitrogen and phosphorus are both essential plant nutrients which, when present in excess, can cause eutrophication and associated water quality decline of freshwaters. High concentrations of dissolved forms of nitrogen can also be toxic to aquatic organisms. Excessive nitrogen and phosphorus concentrations are typically the result of pollution due to human activities, although groundwater in the Central Volcanic Plateau region can have elevated concentrations of phosphorus arising from natural geological sources.
This report summarises the methods used, presents the results and places measured concentrations in context by drawing comparisons with both guideline and regional mean values.

year: 2011-09