Search results for "selection"

Repeated selection : access to a higher education diploma for vocational baccalaureate holders

2021

This thesis examines the access of vocational baccalaureate holders to higher education in light of two major recent developments: the explosion in the number of vocational baccalaureate holders, on the one hand, and the continuous increase in their enrollment rate in higher education, on the other hand. Between 2000 and 2015, the combination of these two phenomena led to an almost fourfold increase in the number of vocational baccalaureates enrolled in higher education. In this research, we explain the obstacles and levers of these new educational paths through the determinants of the successive passage through three stages of selection.First, informal selection corresponds to the influenc…

A relevance feedback CBIR algorithm based on fuzzy sets

2008

CBIR (content-based image retrieval) systems attempt to allow users to perform searches in large picture repositories. In most existing CBIR systems, images are represented by vectors of low level features. Searches in these systems are usually based on distance measurements defined in terms of weighted combinations of the low level features. This paper presents a novel approach to combining features when using multi-image queries consisting of positive and negative selections. A fuzzy set is defined so that the degree of membership of each image in the repository to this fuzzy set is related to the user's interest in that image. Positive and negative selections are then used to determine t…

The continuous sample of working lives: Improving its representativeness

2017

This paper studies the representativeness of the Continuous Sample of Working Lives (CSWL), a set of anonymized microdata containing information on individuals from Spanish Social Security records. We examine several CSWL waves (2005–2013) and show that it is not representative for the population with a pension income. We then develop a methodology to draw a large dataset from the CSWL that is much more representative of the retired population in terms of pension type, gender and age. This procedure also makes it possible for users to choose between goodness of fit and subsample size. In order to illustrate the practical significance of our methodology, the paper also contains an applicatio…

Nature et impacts des effets spatiaux sur les valeurs immobilières : le cas de l'espace urbanisé francilien

2013

International audience

La selezione dei giudici della Corte di giustizia. Poteri e limiti del comitato ex. art. 255 TFUE

2013

Abstract The appointment of judges to supranational and international courts has long been an unstudied area of sovereign activity. However, the growing role and significance of the European Court of Justice (ECJ), by now one of the most significant players within the European political and constitutional space, demands reforms which also affect its architecture. The creation of the advisory panel under article 255 TFUE, is a way to improve judicial independence and proficiency but also a mean to achieve an adequate level of judicial accountability. Indeed, the existing national nomination processes, missing both transparency and public involvement, risk to shape courts which are far away t…

Applying differential geometric LARS algorithm to ultra-high dimensional feature space

2009

Variable selection is fundamental in high-dimensional statistical modeling. Many techniques to select relevant variables in generalized linear models are based on a penalized likelihood approach. In a recent paper, Fan and Lv (2008) proposed a sure independent screening (SIS) method to select relevant variables in a linear regression model defined on a ultrahigh dimensional feature space. Aim of this paper is to define a generalization of the SIS method for generalized linear models based on a differential geometric approach.

Induced smoothing in LASSO regression

The thesis is being carried out with the National research Council at the Institute of Biomedicine and Molecular Immunology "Alberto Monroy" of Palermo, where I am a fellow, under the supervision of MD Stefania La Grutta. Our research unit is focused on clinical research in allergic respiratory problems in children. In particular, we are interested in to assess the determinants of impaired lung function in a sample of outpatient asthmatic children aged between 5 and 17 years enrolled from 2011 to 2017. Our dataset is composed by n = 529 children and several covariates regarding host and environmental factors. This thesis focuses on hypothesis testing in lasso regression, when one is interes…

European traditional tomatoes galore: a result of farmers' selection of a few diversity-rich loci

2022

A comprehensive collection of 1254 tomato accessions, corresponding to European traditional and modern varieties, early domesticated varieties, and wild relatives, was analyzed by genotyping by sequencing. A continuous genetic gradient between the traditional and modern varieties was observed. European traditional tomatoes displayed very low genetic diversity, with only 298 polymorphic loci (95% threshold) out of 64 943 total variants. European traditional tomatoes could be classified into several genetic groups. Two main clusters consisting of Spanish and Italian accessions showed higher genetic diversity than the remaining varieties, suggesting that these regions might be independent seco…

The public–private sector wage gap in Latvia

2018

This study investigates the public-private sector wage gap in Latvia using microdata from the labour force survey. The severity of public sector wage cuts employed as a response to the economic crisis and subsequent recovery provides a test bed to analyse whether and how the public-private sector wage gap has adjusted after consolidation-driven wage cuts. Findings reveal that the observed wage gap is slightly in favour of the public sector; however, once differences in individual characteristics and selection effects are considered, results point to a private sector wage premium. Findings also suggest that the private sector wage premium has increased since the pre-crisis period. A signific…

Unobserved Heterogeneity in Overeducation Models: Is Personality More Important than Ability?

2013

This paper compares the performance of selected personality aspects and ability on explaining the overeducation status of the individual. Ability is defined as the difference between the actual and the predicted income. Personality proves to be an important factor affecting the risk of overeducation. For females, personality allows to better explain mismatch than ability. For males, ability frequently, but not always, performs better than personality. Controlling for personality allows for better classification of the non-overeducated, while controlling for ability improves the classification of the overeducated. The study is done on the pooled sample of 23 European countries, as well as fo…