School: Spatial Statistic and Extreme value
Development date: March 06- 15, 2017
Motivation of developing the school
For about 25 years, the University of La Habana organizes international conferences in applied mathematics: the International Workshop on Operations Research (IWOR) and International Conference on Operations Research are organized alternately in La Habana and in Paris. The ICOR conferences usually hosts between 80 and 100 persons.
During ICOR 2014 were s pointed out several themes that may interest young researchers, graduate students and doctorants. One of them were Extreme Value Theory and Spatial Statistics. Indeed, many problems such dengue epidemics or extreme climate events that affect Cuba needs these tools.
Local Officer: Carlos Bouza.
Universidad de La Habana, CUBA
Officer working in France: Pierre Ribereau
Université Lyon 1, FRANCE
Antecedents and motivations
The research school will focus on spatial statistics and extreme events, with applications in epidemiology and food risks. The main courses will be:
- Spatial Statistics: Geostatistics
- Spatial Statistics: data on grid
- Extreme events: univariate case
- Extreme events: multivariate and spatial case
- Epidemiology and spatial epidemiology
- Food Risk (including extremes)
The school is suited for students, faculty members and non-specialists or practitioners wishing to orient their research to spatial modeling, assessing tail risks and their applications in epidemiology and food risks. The research school also will try to attract researchers from other disciplines like epidemiologists or nutritionists with a good statistical background. Indeed the school aims to be the place for meeting, training and exchanging but also it aims to create a community around these themes.
The organization in the University of La Habana allows to get participants from different Cuban Caribbean and South American Universities as well as specialists of research institutions.
The school will consist in a "classical" part with courses and lectures but also practical works and projects using the R software.
There will be 6 courses of 3 lectures each (3h per lecture). Last Friday will be dedicated to lectures (6 to 10 research talks) of 45 minutes. Both Wednesdays will be free and dedicated to social events.
The speakers of the research talks will be chosen in order to illustrate or complete the courses
Information on the courses
Prof. Cécile Hardouin, FRANCE
Description of the course: Spatial on Lattice
In epidemiology, data are often collected on a discrete set of sites, for instance administrative districts. Markov Random Fields are useful for modelling such data. The spatial dependence is expressed locally, the distribution at one site depending on its neighbors.
We focus on Besag’s auto-models, a class of Markov Random Fields. We present various models and their inference, with examples in the epidemiological context and their extension to spatiotemporal.
Prof. Gwladys Toulemonde, FRANCE.
Description of the course: Extremes I
Extreme events are generally related to severely damaging hazards and their inherent scarcity make any decision related to them difficult. The main issue consists in extrapolating from observed levels to unobserved ones and extreme value theory (EVT) provides a class of models to enable such extrapolation. This part of this course is devoted to univariate EVT. Two approaches will be presented : blockmaxima and threshold exceedances.
Applications will be adressed using the R software.
Prof. Carlo Gaetan, ITALY
Description of the course: Extremes II
This course represents the next step of the study of univariate extremes (Extremes I) and is devoted to multivariate extreme value theory. Two approaches will be also presented : block-maxima and threshold exceedances. An introduction to spatial extreme modelling will be proposed. Finally applications on real data set will be addressed with the R software.
Prof. María Dolores Ugarte, SPAIN
Description of the course: Epidemiology
In the last decades, the study of incidence/mortality data in a region has been established as a basic tool in public health data analysis. This permits to identify potential risk factors of a certain disease and to discover health inequalities. This course will cover classical techniques for risks estimation, simple statistical models for smoothing risks and more sophisticated statistical models including spatial dependence. Real data will be used to illustrate the procedures.
Prof. Jessica Tressou, FRANCE
Description of the course: Food Risk
Certain foods may contain varying amounts of chemicals which may cause major health problems when accumulating inside the body in excessive doses.
These events are most of the time rare. In a static approach, extreme value theory can be used to model the tail of the exposure distribution but it does not account for the kinetics of the chemical of interest in the human body.
Ruin models can be adapted to model the dynamic of the exposure.
Prof. Liliane Bel, FRANCE
Description of the course: Geostatistics for spatially recorded data
Taking into account the resulting spatial dependency is a crucial issue for inference. Assuming an underlying random field with stationary increments, modelling the spatial dependency amounts to estimate a variogram, that will be the main tool for predicting/simulating spatial or spatiotemporal processes. Various kriging techniques for spatial prediction will be presented and some applications in environmental field will be addressed with R software.
The Local Committee is
- Carlos Bouza firstname.lastname@example.org CUBA
- Vivian Sistachs email@example.com CUBA
- Sira Allende firstname.lastname@example.org CUBA
- Maria Leon 'email@example.com', CUBA
International Mathematical Union, European Mathematical Society, Agence Universitaire de la Francophonie, French Embassy, Spanish Embassy, Centre International de Mathématiques Pure et Appliquées and ICTP provide funds for supporting the activities of the selected participants