66 research outputs found
Variance partitioning in spatio-temporal disease mapping models
Bayesian disease mapping, yet if undeniably useful to describe variation in
risk over time and space, comes with the hurdle of prior elicitation on
hard-to-interpret precision parameters. We introduce a reparametrized version
of the popular spatio-temporal interaction models, based on Kronecker product
intrinsic Gaussian Markov Random Fields, that we name variance partitioning
(VP) model. The VP model includes a mixing parameter that balances the
contribution of the main and interaction effects to the total (generalized)
variance and enhances interpretability. The use of a penalized complexity prior
on the mixing parameter aids in coding any prior information in a intuitive
way. We illustrate the advantages of the VP model on two case studies
How the Black Swan damages the harvest: statistical modelling of extreme events in weather and crop production in Africa, Asia, and Latin America
How the Black Swan damages the harvest: Extreme weather events and the fragility of agriculture in development countries
Climate change constitutes a rising challenge to the agricultural base of developing countries. Most of the literature has focused on the impact of changes in the means of weather variables on mean changes in production and has found very little impact of weather upon agricultural production. Instead, we focus on the relationship between extreme events in weather and extreme losses in crop production. Indeed, extreme events are of the greatest interest for scholars and policy makers only when they carry extraordinary negative effects. We build on this idea and for the first time, we adopt a conditional dependence model for multivariate extreme values to understand the impact of extreme weather on agricultural production. Specifically, we look at the probability that an extreme event drastically reduces the harvest of any of the major crops. This analysis, which is run on data for six different crops and four different weather variables in a vast array of countries in Africa, Asia and Latin America, shows that extremes in weather and yield losses of major staples are associated events. We find a high heterogeneity across both countries and crops and we are able to predict per country and per crop the risk of a yield reduction above 90% when extreme events occur. As policy implication, we can thus assess which major crop in each country is less resilient to climate shocks
Assessment of adult body composition using bioelectrical impedance: comparison of researcher calculated to machine outputted values
Kriging uncertainty for functional data: a comparison study
Uncertainty evaluation for spatial prediction of curves remains an open issue in the functional data literature. We consider three different approaches that rely on semi-parametric bootstrapping, principal component analysis and classical inference for additive models respectively
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