1,720,956 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Suivi de la pluviométrie au Nord-Sénégal de 1954 à 2013 : étude de cas des stations synoptiques de Matam, Podor et Saint-Louis
Get PDFSur la série 1954-2013, le Nord-Sénégal a connu de très fortes fluctuations pluviométriques tant du point de vue de répartition intra-annuelle qu’en termes d’évolution interannuelle. Le démarrage de la véritable saison hivernale, défini par les occurrences, ainsi que sa durée reste une problématique majeure notamment dans le domaine agronomique alors que l’évolution interannuelle y est révélatrice de tendances souvent généralement observées dans tout le Sahel avec toutefois des réalités propres à la zone d’étude et qui donc l’identifient au reste de la région. Plusieurs méthodes sont utilisées dans cet article dans le but de suivre ces différentes fluctuations. Le décèlement des occurrences du maximum pluviométrique nous permet de localiser la véritable saison des pluies notamment son démarrage et sa durée. La méthode des écarts à la moyenne est utilisée dans le but de vérifier les variabilités (déficits et excédents) interannuelles. Nous avons par la suite appliqué le test non-paramétrique de Pettitt aux données de notre série (1954-2013) dans le but de détecter la/les rupture (s) de tendance dans l’évolution de la pluviométrie sur nos 60 années d’étude. La division de la série en sous-série nous a renseigné sur la tendance actuellement observée dans la région. Nous avons enfin corrélé à l’aide de la corrélation r de Pearson la hauteur d’eau annuelle et le nombre de jours de pluie afin d’exprimer l’intensité de la pluviométrie. Les résultats montrent que la saison des pluies qui dure généralement de juillet à septembre se concentre sur seulement deux mois qui enregistrent à eux seuls l’essentiel des abats annuels (juillet-Août à Matam avec 87 % et Août-septembre à Saint-Louis et Podor avec respectivement 87 et 84 %). Ces observations traduisent ainsi un démarrage de l’hivernage dans la deuxième quinzaine de juillet et une fin au plus tard dans la 1re décade du mois d’octobre. Les écarts à la moyenne révèlent une très grande variabilité interannuelle avec une forte présence d’années déficitaires (29/60 à Saint-Louis, 33/60 à Podor et la moitié de la série à Matam). L’application du test de Pettitt indique un seul point de rupture de tendance dans la série (1969 à l’ouest et à l’est de la zone et 1970 au centre) alors que la division de la série en sous-série y révèle un retour à la normale depuis les années 2000. La corrélation de Pearson montre une forte relation entre hauteur d’eau annuelle et nombre de jours de pluie (r = 0.58 à la station de Saint-Louis, r = 0,7 à la station de Podor et r = 0,59 à la station de Matam).From 1954 to 2013, the north of Senegal has experienced considerable fluctuations in rainfall from the point of view of intra-annual distribution and in terms of inter-annual evolution. The start of real winter season, defined by the occurrence and its duration remains a major problem especially in the agricultural field while the inter-annual evolution is often suggestive of general trends across all the Sahel but with the realities characteristic of the study area and therefore identify it with the rest of the region. Several methods are used in this article in order to follow these different fluctuations. The detection of occurrences of maximum rainfall allows us to locate the real rainy season particularly its start and duration. The method of differences in the average is used in order to verify the variability (deficits and excesses) inter-annual. We subsequently applied the non-parametric Pettitt test to the data in our series (1954-2013) in order to detect the rupture (s) trend in the evolution of rainfall on our 60 years’ study. The division of the series in subseries has informed us about the current trend in the region. Finally the r Pearson correlation between annual water height and number of rainy days was used to show the intensity of rainfall. The results show that the rainy season, which usually lasts from July to September, concentrates during only two months which record the main part of the annual rains (July-August in Matam with 87 % and August-September in Saint-Louis and Podor with respectively 87 and 84 %). These observations reflect a start of the rainy season in the second fortnight of July and an end in the first decade of October at the latest. The values of standard deviation show a high interannual variability with a strong presence of deficit years (29/60 in Saint-Louis, Podor 33/60 and half of the series in Matam). The application of Pettitt test indicates a single break point in the trend series (1969 to the west and east of the area and in 1970 to the center), while the division of the series in sub-series reveals a return to normal since the 2000s. Pearson correlation shows a strong relationship between high annual water and number of rainy days (r = 0.58 at the station of Saint- Louis, r = 0.7 at the station of Podor and r = 0.59 at the station of Matam)
Les lithométéores au Nord Sénégal : dégradation de la qualité de l’air, réduction de la visibilité horizontale et conséquences socio-économiques
No full textkoamabayili/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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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