Laurent Donzé

Laurent Donzé
Université de Fribourg · Department of Informatics

Professor

About

46
Publications
4,095
Reads
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172
Citations

Publications

Publications (46)
Article
Full-text available
We propose a practical procedure of construction of fuzzy confidence intervals by the likelihood method where the observations and the hypotheses are considered to be fuzzy. We use the bootstrap technique to estimate the distribution of the likelihood ratio. The chosen bootstrap algorithm consists on randomly drawing observations by preserving the...
Conference Paper
The measure of poverty is an excellent field to apply fuzzy statistics. Indeed, nowadays, this measure is fast always considered as multidimensional. Furthermore, the evaluation of a poverty level, which is on a large scale subjective and varying between individuals and upon situations, has undoubtfully a fuzzy content. We propose, first, to show i...
Chapter
We develop a fuzzy hypothesis testing approach where we consider the fuzziness of data and the fuzziness of the hypotheses as well. We give the corresponding fuzzy p-value with its \(\alpha \)-cuts. In addition, we use the so-called “signed distance” operator to defuzzify this p-value and we provide the convenient decision rule. Getting a defuzzifi...
Chapter
The central moments of a random variable are extensively used to understand the characteristics of distributions in classical statistics. It is well known that the second central moment of a given random variable is simply its variance. When fuzziness in data occurs, the situation becomes much more complicated. The central moments of a fuzzy random...
Chapter
Testing hypotheses could sometimes benefit from the fuzzy context of data or from the lack of precision in specifying the hypotheses. A fuzzy approach is therefore needed for reflecting the right decision regarding these hypotheses. Different methods of testing hypotheses in a fuzzy environment have already been presented. On the basis of the class...
Chapter
Nous présentons une approche d'ANOVA simple étendue à l'environnement flou. Sachant que le calcul d'un produit flou s'avère compliqué, une approximation de ce produit est requise. Notre contribution est d'approximer la différence entre deux nombres flous par une méthode intitulée méthode de la ”signed distance”. Le but est alors de réduire la compl...
Conference Paper
Fuzzy statistical methods appear to be well suited to situations where the data we are collecting are exposed to fuzziness and uncertainty. Calculating for instance analytically or numerically the fuzzy variance could be advantageous. Yet, this task is not simple, especially regarding the difficulties in measuring the multiplication of two fuzzy se...
Technical Report
Full-text available
Mouvements migratoires en périodes d'élections ou de votations à Moutier Brève expertise concernant une étude statistique anonyme transmise au Ministère public du canton de Berne par Christoph Neuhaus, Conseiller d'État bernois, en mars 2018. par Laurent Donzé Fribourg, le 17 mai 2018 © L. Donzé, Département d'informatique, Université de Fribourg (...
Data
Années électorales et années de vote (sous forme de variables muettes) pour les communes de Moutier, St-Imier et Tramelan de 1981 à 2016.
Data
Variables de contrôle: quotités d'impôt communale et cantonale, delta en % de croissance du PIB. Différentes sources publiques (OFS, Canton de Berne).
Data
L'étude statistique anonyme a été remise au journal Le Quotidien Jurassien par le Conseiller d'État Christoph Neuhaus. Le journal nous l'a ensuite transmise pour expertise.
Data
Données mensuelles pour la commune de Moutier de 2014 à 2017 sur l'émigration et l'immigration (de citoyens suisses et étrangers), ainsi qu'une variable muette pour les mois post-vote communaliste. Sources: Municipalité de Moutier.
Data
Code R permettant de répliquer les résultats.
Conference Paper
We extend the classical approach of hypothesis testing to the fuzzy environment. We propose a method based on fuzziness of data and on fuzziness of hypotheses at the same time. The fuzzy p-value with its α-cuts is provided and we show how to defuzzify it by the signed distance method. We illustrate our method by numerical applications where we trea...
Chapter
Having in mind the evaluation of linguistic questionnaires, we aim to present a comparison in terms of statistical measures between on one side a relative recent defuzzification method, known as the signed distance method, and on the other side, other well-known traditional methods. The distribution’s properties of data resulting from the defuzzifi...
Article
In this article we investigate the impact of the Carbon Disclosure Project, as one of the binding reporting standards on a firms' emissions. In particular, we focus on firms from the industrial sector and analyse whether reporting to Carbon Disclosure Project has a positive effect and leads the firm to reduce their CO2 emissions. In order to evalua...
Article
Linguistic questionnaires are one of the very challenging keys in the world of surveys, in particular considering their fuzziness and imprecision. Many approaches have been used to evaluate them. In this paper, we show the individual and global evaluations of a linguistic questionnaire using fuzzy logic, and the relation between these two evaluatio...
Chapter
Marketing deals with identifying and meeting the needs of customers. It is therefore both an art and a science. To bridge the gap between art and science, soft computing, or computing with words, could be an option. This chapter introduces fundamental concepts such as fuzzy sets, fuzzy logic, and computing with linguistic variables and terms. This...
Article
Marketing deals with identifying and meeting the needs of customers. It is therefore both an art and a science. To bridge the gap between art and science, soft computing, or computing with words, could be an option. This chapter introduces fundamental concepts such as fuzzy sets, fuzzy logic, and computing with linguistic variables and terms. This...
Chapter
The aim of this chapter is to present a fuzzy segmentation model that combines statistical and Artificial Intelligence techniques to identify and quantify multifaceted consumers. One of the primary challenges faced by companies is getting to know their consumers. The latter are increasingly complex, versatile, ever-changing, and even contradictory;...
Article
This paper investigates the impact of the promotional activities of the Swiss Commission of Technology and Innovation (CTI) on the innovation performance of the supported firms based on a matched-pairs analysis of 199 firms supported by the CTI in the period 2000–2002. CTI's promotional activities significantly improved the innovation performance o...
Article
Full-text available
We apply different matched-pair methods to evaluate the policy of sustaining the adoption of advanced manufacturing technologies by Swiss firms and we compare it in decomposing the selection bias. In this aim we present the evaluation problem, the decomposition of the selection bias and the estimation techniques used. We base our study on the J. He...
Article
Full-text available
In order to correct the bias due to unit non-response for the KOF ETH Zurich's business (mail) surveys, we usually use the results of a second (phone) survey by the non-respondents. Taking the case of the survey 2000 on 'Organization and Information Technologies' in the Swiss economy, we describe how to build the sample of this second survey and ho...
Article
Full-text available
The imputation of missing values is generally used to correct the item nonresponse of a survey. For the KOF/ETHZ-Innovation Survey 1999, this problem is managed with a multiple imputation. We give some theoretical backgrounds of the method and illustrate it by some examples. We compare our approach with the one used by Eurostat for the Second Commu...
Article
Full-text available
First, we present the OAXACA'S (1973) traditional measure of the wage discrimination. We mention the shortcomings. Then, we describe the method proposed by SHRESTHA and SAKELLARIOU (1996). The later is applied to the survey 1994 on the Swiss wage structure. A significant discrimination in favour to the male is shown as well for the whole economy as...
Article
The purpose of the study is to identify a number of barriers to communication which occur in the international Swiss telephone flows, i.e. to reveal in which way some factors are able to stimulate or to hamper the telephone flows. To do this, we construct a matrix of Swiss telephone flows for the month november 1989 from the Swiss PTT's data. This...

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Projects

Projects (4)
Project
Investigating the influence of modeling the fuzziness in data.
Project
We explore the effect decomposition of a principal relationship between binary random variables and propose a valid and useful approach for the analysis of the components of total effect in nonlinear models.