Institution
Paris West University Nanterre La Défense
Education•Paris, France•
About: Paris West University Nanterre La Défense is a education organization based out in Paris, France. It is known for research contribution in the topics: Computer science & Politics. The organization has 895 authors who have published 1430 publications receiving 21712 citations.
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27 Jun 2005
TL;DR: This work investigates learning methods based on empirical minimization of the natural estimates of the ranking risk of U-statistics and U-processes to give a theoretical framework for ranking algorithms based on boosting and support vector machines.
Abstract: A general model is proposed for studying ranking problems. We investigate learning methods based on empirical minimization of the natural estimates of the ranking risk. The empirical estimates are of the form of a U-statistic. Inequalities from the theory of U-statistics and U-processes are used to obtain performance bounds for the empirical risk minimizers. Convex risk minimization methods are also studied to give a theoretical framework for ranking algorithms based on boosting and support vector machines. Just like in binary classification, fast rates of convergence are achieved under certain noise assumption. General sufficient conditions are proposed in several special cases that guarantee fast rates of convergence.
78 citations
TL;DR: The authors showed that experience rating implies negative occurrence dependence under moral hazard: individual claim intensities decrease with the number of past claims and then showed that dynamic insurance data allow to distinguish this moral-hazard effect from dynamic selection on unobservables.
Abstract: This paper exploits dynamic features of insurance contracts in the empirical analysis of moral hazard. We first show that experience rating implies negative occurrence dependence under moral hazard: individual claim intensities decrease with the number of past claims. We then show that dynamic insurance data allow to distinguish this moral-hazard effect from dynamic selection on unobservables. We develop nonparametric tests and estimate a flexible parametric model. We find no evidence of moral hazard in French car insurance. Our analysis contributes to a recent literature based on static data that has problems distinguishing between moral hazard and selection and dealing with dynamic features of actual insurance contracts. Methodologically, this paper builds on and extends the literature on state dependence and heterogeneity in event-history data. (JEL: D82, G22, C41, C14)
78 citations
TL;DR: In this paper, the Poincare inequality was shown to be equivalent to the quadratic transportation cost inequalities, and new families of inequalities were introduced for relative entropy, which are equivalent to poincare inequalities for T 2 but not the logarithmic Sobolev inequality.
76 citations
TL;DR: Developing some elements of the framework required for studying biocultural interactions, focusing on one component of management: farmers' decisions on what to plant, and the structure of germplasm exchange among farmers, suggest that sorghum populations managed by the Duupa function like source–sink metapopulations.
76 citations
Trinity College, Dublin1, University of Southern Queensland2, University of Exeter3, University of Queensland4, Utrecht University5, University of Melbourne6, University of Indonesia7, Centre national de la recherche scientifique8, Paris West University Nanterre La Défense9, University of Gdańsk10, University of Lausanne11, University of Lisbon12, East China Normal University13, Université libre de Bruxelles14, University of the Witwatersrand15, University of Tennessee16, Ludwig Maximilian University of Munich17, National University of Distance Education18, Pontifical Catholic University of Chile19, The Chinese University of Hong Kong20, Aarhus University21, University of Helsinki22, Nagoya University23, University of Jena24, Universidade Federal de Sergipe25, ISCTE – University Institute of Lisbon26, University of Copenhagen27, University of Trento28, Hungarian Academy of Sciences29, Daugavpils University30, National University of Malaysia31, Kurukshetra University32, California State University33, Federal University of Paraíba34, Carleton University35
TL;DR: It is found that societal inequality enhances the perception that society is breaking down (anomie) and that a strong leader is needed to restore order (even when that leader is willing to challenge democratic values).
Abstract: Societal inequality has been found to harm the mental and physical health of its members and undermine overall social cohesion. Here, we tested the hypothesis that economic inequality is associated with a wish for a strong leader in a study involving 28 countries from five continents (Study 1, N = 6,112), a study involving an Australian community sample (Study 2, N = 515), and two experiments (Study 3a, N = 96; Study 3b, N = 296). We found correlational (Studies 1 and 2) and experimental (Studies 3a and 3b) evidence for our prediction that higher inequality enhances the wish for a strong leader. We also found that this relationship is mediated by perceptions of anomie, except in the case of objective inequality in Study 1. This suggests that societal inequality enhances the perception that society is breaking down (anomie) and that a strong leader is needed to restore order (even when that leader is willing to challenge democratic values).
76 citations
Authors
Showing all 1053 results
| Name | H-index | Papers | Citations |
|---|---|---|---|
| Erasmo Carrera | 75 | 829 | 23981 |
| Dan Sperber | 67 | 207 | 32068 |
| Balázs Égert | 46 | 204 | 6600 |
| Mohamed El Hedi Arouri | 43 | 212 | 7460 |
| Agnès Bénassy-Quéré | 40 | 215 | 5762 |
| Diego Gil | 39 | 98 | 5011 |
| Valérie Mignon | 37 | 193 | 5081 |
| Julien Chevallier | 37 | 269 | 4905 |
| Shah Nawaz Burokur | 36 | 238 | 3969 |
| Gerard Kerkyacharian | 35 | 78 | 6289 |
| Claire Lhuillier | 34 | 72 | 3852 |
| Michèle Carlier | 32 | 95 | 2983 |
| Olivier Polit | 31 | 125 | 2226 |
| Marc Flandreau | 31 | 167 | 3713 |
| Patrick Cattiaux | 30 | 95 | 2863 |