1,721,233 research outputs found
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
Defining incident vertebral deformities in population studies: a comparison of morphometric criteria
No full textVarious morphometric criteria have been used to define incident vertebral deformity. The aim of this analysis was to compare the relative validity of two established criteria and a novel method in which these criteria were combined. Men and women aged 50 years and over were recruited from population registers across Europe and had lateral spinal radiographs performed using a standard protocol. A subsample of individuals had bone mineral density (BMD) at the spine or femoral neck. Subjects were followed prospectively and a subsample had repeat spinal radiographs a median of 3.8 years after the baseline survey. All radiographs were evaluated morphometrically in the radiology coordinating center in Berlin. Anterior, middle and posterior height were recorded in all vertebrae from T4 to L4. On the basis of these morphometric measurements incident vertebral deformity was defined using one of three methods: (i) the change method - a change in any vertebral height of 20% or more between films, plus the additional requirement that a vertebral body have changed in absolute vertebral height by 4 mm or more; (ii) the point prevalence method, where a vertebra satisfies criteria for a prevalent deformity (McCloskey-Kanis) on the follow-up, though not the baseline film; (iii) a combination of the height reduction and the point prevalence criteria. Paired films were also evaluated qualitatively by an experienced radiologist for the presence of incident vertebral deformity. Logistic regression was used to compare the three morphometric methods using known risk factors for vertebral deformity including age, baseline vertebral deformity and BMD, and the qualitative evaluation. Computer simulation was used to determine the potential degree of bias and loss of statistical efficiency due to misclassification for each of the three methods, using the radiologist's assessment of incident deformity as the reference. Six thousand eight hundred subjects were included in this analysis. Of these 450 had sustained an incident vertebral deformity according to at least one of the three morphometric methods. The distribution of risk factors was similar in the subjects who satisfied only one morphometric criterion and those who satisfied neither. However, the subjects who satisfied both criteria had a very different distribution of risk factors: they were older, more likely to be female, more likely to have had a previous vertebral deformity and more likely to have an incident fracture in the opinion of an experienced radiologist. Using computer simulation, at low incidence levels, combining the criteria led to greater statistical efficiency and less bias in estimating associations with risk factors. Thus in this analysis the combination of the point prevalence and 20% change in height criterion for defining incident vertebral deformity showed a stronger relationship with clinical risk factors than either single criterion. Its application in population-based studies would increase the likelihood of detecting risk factors for incident vertebral deformity for a given sample size
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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