Université de Neuchâtel

Handling auxiliary variables in survey sampling and nonresponse

Vallée, Audrey-Anne ; Tillé, Yves (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2019.

This manuscript is dedicated to the use of auxiliary information in survey sampling and nonresponse. We are interested in the integration of auxiliary variables in sampling methods and in the treatment of nonresponse to improve the efficiency and the precision of surveys. We also deal with the calculation of the precision of estimators. Indeed, variances rapidly become difficult to calculate when...

Université de Neuchâtel

Estimation of a counterfactual wage distribution using survey data

Anastasiade, Mihaela-Cãtãlina ; Tillé, Yves (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

Wage discrimination based on gender is a debated topic nowadays. While wage discrimination is prohibited by the Universal Declaration of Human Rights, studies show that women are systematically paid less than men. Wage discrimination is defined as the fact that two groups sharing the same characteristics and performing the same tasks are paid differently. However, this definition is not easy to...

Université de Neuchâtel

Random sampling with repulsion

Wilhelm, Matthieu ; Tillé, Yves (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

In this thesis, we explore the concept of repulsion and exploit it to develop new sampling designs. The first chapter is a review of the literature about sampling in finite population and consists of two distinct parts. In the first one, we suggest three principles as guidelines for designing a survey: randomization, overrepresentation and restriction. In the second part, we review the...

Université de Neuchâtel

New methods to handle nonresponse in surveys

Hasler, Caren ; Tillé, Yves (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2015.

This document focuses on nonresponse in sample surveys. Mainly, methods to handle nonresponse in complex surveys are proposed. The first chapter of this document introduces concepts and notation of survey sampling and nonresponse. The second chapter proposes an algorithm for stratified balanced sampling for populations with large numbers of strata. The third chapter of this document presents a...

Université de Neuchâtel

Imputation of income variables in a survey context and estimation of variance for indicators of poverty and social exclusion

Graf, Eric ; Tillé, Yves (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2014 ; 2440.

This Phd thesis proposes to develop a method of imputation for income variables allowing direct analysis of the distribution of such data, particularly the estimation of complex statistics such as indicators for poverty and social exclusion as well as the estimation of their precision. In an introduction chapter we present the Swiss Survey on Income and Living Conditions (SILC) which we...

Université de Neuchâtel

Inférence basée sur le plan pour l'estimation de petits domaines = Design-based inference for small area estimation

Randrianasolo, Toky ; Tillé, Yves (Dir.) ; Madre, Jean-Loup (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2013 ; 2377.

The strong demand for results at a detailed geographic level, particularly from national surveys, has raised the problem of the fragility of estimates for small areas. This thesis addresses this issue with specific methods based on the sample design. These ones consist of building new weights for each statistical unit. The first method consists of optimizing the re-weighting of a subsample survey...

Université de Neuchâtel

Measuring inequality in finite population sampling

Langel, Matti ; Tillé, Yves (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2012 ; 2252.

This document focuses on the estimation of inequality measures for complex survey data. The proposed methodology takes into account both the complexity of these generally non-linear functions of interest and the complexity of the sampling strategy. The first chapter is dedicated to the presentation and definition of the main concepts used in both inequality and survey sampling theory. In the...

Université de Neuchâtel

Evaluation and development of strategies for sample coordination and statistical inference in finite population sampling

Nedyalkova, Desislava ; Tillé, Yves (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2009 ; Th.2092.

This Ph.D. thesis concentrates on two important subjects in survey sampling theory. One is the problem of the foundation for statistical inference in finite population sampling, and the other is the problem of coordination of samples over time. The thesis is based on four articles. Three of them are already published and the last one is submitted for publication. First, we show that the...

Université de Neuchâtel

Unequal probability sampling and repeated surveys

Qualité, Lionel ; Tillé, Yves (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2009 ; Th. 2091.

This document is divided into two parts. The first part revolves around the properties of some unequal probability survey sampling designs, and the second part deals with repeated surveys. While the topics developed in these two parts appear to be largely different, they are in fact related. The first part is devoted to the study of properties of two sampling designs with fixed size. In a first...

Université de Neuchâtel

La consommation de tabac, d’alcool et de drogues chez les lesbiennes et les femmes bisexuelles de Suisse romande : une utilisation de la méthode Respondent-Driven Sampling

Berrut, Sylvan ; Tillé, Yves (Dir.)

Mémoire de diplôme universitaire : Université de Neuchâtel, 2007.

De nombreuses recherches, notamment nord-américaines, indiquent que les femmes homosexuelles et bisexuelles sont plus souvent fumeuses et consomment plus fréquemment de l’alcool et des drogues que les femmes hétérosexuelles. Est-ce le cas en Suisse et si oui, dans quelles proportions ? Ce travail visait principalement deux buts : trouver une méthode de récolte de données qui soit à la...