1,721,087 research outputs found
V. Eldon Ball and George W. Norton (eds), Agricultural Productivity : Measurement and Sources of Growth. Boston, Kluwer Academic Publishers, 2002
No full textLarue Bruno. V. Eldon Ball and George W. Norton (eds), Agricultural Productivity : Measurement and Sources of Growth. Boston, Kluwer Academic Publishers, 2002. In: Cahiers d'Economie et sociologie rurales, N°66, 1er trimestre 2003. pp. 82-84
Willingness to pay for drinking water in the Sahara : the case of Douentza in Mali
No full textThis study compares two methods of predicting the willingness to pay for drinking-water delivery systems in the semi-urban Sahara as a function of the hypothetical characteristics of possible water delivery points. The first, a linear regression model, predicts the monetary amount a household should be willing to pay for each bucket of water from the source. The second, a LOGIT model, explains the decision to purchase water or not. Both methods are based on the full-price budget constrained model of standard demand theory — which explains quantity demanded as a function of prices and the opportunity cost of time spent on consumption. The most consistently significant explanatory variable in our empirical models is the relative distance to the planned new source compared to the best existing source.Consentement à payer pour de l'eau potable au Sahara : le cas de Douentza au Mali
La présente étude compare deux méthodes de prévision du consentement à payer pour de l'eau potable dans des systèmes d'adduction en région semi-urbaine au Sahara. Les deux modèles sont estimés en fonction des caractéristiques hypothétiques de divers points d'adduction possibles. Le premier modèle, reposant sur une régression multiple, prévoit la somme d'argent qu'un ménage consentira à payer pour chaque seau d'eau potable provenant d'une source donnée. Le second modèle, employant une spécification de type logit, vise à expliquer la décision d'acheter ou non de l'eau potable. Les deux approches reposent sur le modèle de prix complets tel que proposé par la théorie de la demande. Ce modèle explique la quantité d'eau demandée en fonction des prix et du coût d'opportunité du temps affecté à la consommation. Dans nos modèles empiriques, la variable explicative qui s'avère la plus significative est la proximité de la nouvelle source prévue divisée par la distance à la meilleure source existante.Calkins Peter, Larue Bruno, Vézina Marc. Willingness to pay for drinking water in the Sahara : the case of Douentza in Mali. In: Cahiers d'Economie et sociologie rurales, N°64, 3e trimestre 2002. pp. 37-56
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
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
Comparaison des tarifs Ad Valorem et spécifique dans un contexte d'aversion aux pertes
No full textUne des principales réalisations du Cycle de l’Uruguay fut la transformation de nombreuses barrières non tarifaires en tarifs. Le désir d’accroître l’efficience et la transparence des politiques commerciales motivent une démarche de simplification des tarifs dans le cycle de Doha. Cette démarche encourage les pays-membres à utiliser des tarifs ad valorem plutôt que des tarifs spécifiques ou autres. Les tarifs spécifiques sont moins populaires que les tarifs ad valorem, étant surtout utilisés pour limiter les importations de produits agricoles. Une importante différence entre les deux types de tarifs est que la marge entre le prix interne et le prix mondial décroit avec le prix mondial pour le tarif ad valorem alors que cette marge est constante pour le tarif spécifique. Comme les prix des produits agricoles sont très volatiles, on pourrait s’attendre à ce que ces deux instruments de protection ne soient pas équivalents. Nous modélisons une filière avec des détaillants dotés de pouvoir de marché qui achètent leurs intrants sur le marché mondial à prix fixe et de producteurs agricoles preneurs de prix dont le comportement est caractérisé par une aversion aux pertes. Les tarifs optimaux sont dérivés en présence d’un prix mondial stable et d’un prix mondial volatile. Des simulations numériques sont faites pour faciliter les comparaisons des deux types de tarifs. Le tarif spécifique est démontré meilleur instrument que le tarif optimal ad valorem pour les importateurs de produits agricoles, lorsque le prix mondial est volatile. La taxe optimale n’est pas zéro, mais négative à moins que le prix mondial soit très élevé. Sur un marché concurrentiel, la taxe optimale est zéro et positif respectivement face à des prix internationaux volatiles et une aversion aux pertes des producteurs. L’aversion aux pertes des producteurs fait diminuer la taille du subside optimal sur un marché peu concurrentiel. Ainsi, l’argument d’aversion aux pertes justifie la popularité des tarifs spécifiques en agriculture mais n’explique pas le niveau élevé des tarifs observés. Les tarifs élevés ne font qu’amplifier les problèmes de concurrence découlant de la présence de peu de détaillants/distributeurs agroalimentaires dans la plupart des pays
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