John Libbey Eurotext

Science et changements planétaires / Sécheresse

Evaluating technologies for agricultural development: How to capture the true impact? Volume 24, issue 4, Octobre-Novembre-Décembre 2013

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1 Much of the lost nitrogen is washed out of the soil by rain, entering the water bodies of lakes, rivers and oceans causing dense algal blooms resulting in vast anoxic dead zones. A significant proportion is released to the atmosphere as nitrous oxide, a greenhouse gas with 296 times the global warming potential of carbon dioxide, and a long atmospheric life (∼166 years). Additionally, the manufacture of nitrogen fertilizers are extremely fossil-fuel intensive making it a major source of carbon dioxide emissions.

2 Independent variables that affect a particular dependent variable are said to be orthogonal if they are uncorrelated.

3 User friendly software packages have been created which compute statistical power under different scenarios ( http://sitemaker.umich.edu/group-based/optimal_design_software), while Bloom (1995) provides a detailed review of power calculations.

4 A logistic regression predicts the outcome of a categorical dependent variables based on one or more predictor variables.

5 The main assumptions being – model is correctly specified, the error term is on average zero and the error term is uncorrelated to the other variables.