1,721,021 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
Consolidation de l'information hydrologique disponible localement et régionalement pour l'estimation probabiliste du régime des crues.
Get PDFLe praticien, lors de l'étape de prédétermination des débits de crue, est souvent confronté à
un jeu de données restreint. Dans notre travail de recherche, nous avons proposé trois nouveaux
modèles probabilistes spécialement conçus pour l'estimation des caractéristiques du régime des
crues en contexte partiellement jaugé. Parmi ces modèles, deux d'entre eux sont des modèles dits
régionaux, i.e. intégrant de l'information en provenance de stations ayant un comportement réputé
similaire à celui du site étudié. Ces modèles, basés sur la théorie Bayésienne, ont montré une grande
robustesse au degré d'hétérogénéité des sites appartenant à la région. De même, il est apparu
que pour l'estimation des forts quantiles (T ≥ 50 ans), l'idée d'un paramètre régional contrôlant
l'extrapolation est pertinente mais doit d'être intégrée de manière souple et non imposée au sein de
la vraisemblance. L'information la plus précieuse dont le praticien dispose étant celle en provenance
du site d'étude, le troisième modèle proposé revient sur l'estimation à partir des seules données
contemporaines au site d'étude. Ce nouveau modèle utilise une information plus riche que celle
issue d'un échantillonnage classique de v. a. i. id. maximales puisque toute la chronique est exploitée.
Dès lors, même avec seulement cinq années d'enregistrement et grâce à une modélisation de la
dépendance entres les observations successives, la taille des échantillons exploités est alors bien plus
importante. Nous avons montré que pour l'estimation des quantiles de crues, ce modèle surpasse très
nettement les approches locales classiquement utilisées en hydrologie. Ce résultat est d'autant plus
vrai lorsque les périodes de retour deviennent importantes. Enfin, part construction, cette approche
permet également d'obtenir une estimation probabiliste de la dynamique des crues.
To define the design flood, practitioners must often deal with only few data available. The aim of
this work was to propose new classes of probabilistic models that are more accurate for this kind of
applications. In this perspective, we propose three different models: two regional approaches and
a fully local one. Unlike fully local models, the regional approaches include information from other
gauging stations. Our results show that the proposed regional Bayesian estimators are more robust
to the discordancy degree of the sites within the region. In addition, for larger quantile estimation
(T ≥ 50 years), the concept of a regional parameter which controls the tail behaviour seems to be
relevant. However, this concept has to be proposed and not imposed within the likelihood function.
It is overwhelmingly clear that the most important information one disposes is the target site one.
To this aim, we propose a third model that is fully local, i.e., which only uses the latest recorded
data. This new model is innovative as the whole time series is involved in the estimation procedure;
not only c1uster maxima. Consequently, even with only a five years record length time series, the
sample size becomes large. Our results show that, for flood quantile estimations, this model c1early
outperforms the estimators conventionally used in hydrology. Furthermore, by definition, this model
allows inferences on flood dynamics
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
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