1,721,217 research outputs found
Please call again: Correcting nonresponse bias in treatment effect models
No full textWe propose a novel selectivity correction procedure to deal with survey attrition in treatment effect models, at the crossroads of the Heckit model and the bounding approach of Lee (2009). As a substitute for the instrument needed in sample selectivity correction models, we use information on the number of prior calls made to each individual before obtaining a response to the survey. We obtain sharp bounds to the average treatment effect on the common support of responding individuals. Because the number of prior calls brings information, we can obtain tighter bounds than in other nonparametric methods
Mode de garde du jeune enfant, travail des mères, et développement de l’enfant
No full textLe paysage de la famille et de la vie professionnelle a considérablement changé ces dernières années, les femmes passant de plus en plus souvent une partie de leur temps de la production domestique au travail marchand. Étant donné que les femmes restent très souvent les principales fournisseuses de soins des enfants, cette transformation affecte non seulement les femmes elles-mêmes, mais aussi leurs partenaires, leurs enfants et les autres membres de la famille. Cette thèse présente trois études empiriques sur différents sujets liés à l'économie de la famille. Les deux premiers chapitres traitent de deux questions entourant la procréation: la garde des enfants et le congé parental, et leur impact sur les mères et les enfants. Le dernier chapitre est consacré à l'étude des politiques pro-natalistes destinées à modifier la fécondité.The landscape of family and work-life has changed considerably in recent years, as women are increasingly shifting part of their time from household production to market work. Since women very often remain the primary caregivers of children, this transformation affects not only women themselves but also their partners, children, and other family members. This dissertation presents three empirical investigations on different topics related to the economics of the family. The first two chapters address two issues surrounding childbearing: child care and parental leave, and their impact on mothers and children. The last chapter is dedicated to studying pro-natalist policies designed to alter fertility
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Essais en économique empirique
No full textDans ma thèse, j'étudie trois sujets différents en économie empirique. Dans le premier projet, je développe une nouvelle méthodologie économétrique pour améliorer l'inférence dans les expériences avec "imperfect compliance". Dans mon deuxième projet, j'étudie si la stigmatisation des demandeurs d'aide sociale par les médias joue un rôle dans le non-recours aux prestations sociales. Dans mon troisième projet, j'étudie l'effet des contrats à durée déterminée sur la structure salariale française, en mettant particulièrement l'accent sur le rôle du partage différentiel de la rente par type de contrat et la compensation salariale associée à l'insécurité de l'emploi.In my dissertation, I study three different subjects in empirical economics. In the first project, I develop a new econometric methodology to improve inference in experiments with imperfect compliance. In my second project, I study whether stigmatization of benefit seekers by the media plays a role in non-take-up of benefits. In my third project, I study the effect of fixed-term contracts on the French wage structure, with a particular focus on the interaction between compensating wage differentials for job security and differential rent-sharing by contract type
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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