1,721,011 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
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
FUNCTIONAL CHARACTERISATION, DISEASE BURDEN AND PREDICTORS OF MORTALITY IN PATIENTS WITH CHRONIC OBSTRUCTIVE PULMONARY DISEASE: PRELIMINARY RESULTS FROM THE ITALIAN COPD REGISTRY
Get PDFBackground
Chronic Obstructive Pulmonary Disease (COPD) is a complex and heterogeneous disease characterized by variable respiratory symptoms and by different degrees of small airways dysfunction and emphysema. Patients with COPD are at increased risk of exacerbations, hospitalizations and mortality, but although over the years numerous severity classification systems have been proposed, they often revealed to be poorly associated with clinical outcomes. The degree of disease burden, the role of lung function, comorbidities and pharmacological therapy in real life is still poorly understood.
Aim of the study
The co-primary outcomes of the study were 1) to evaluate the informativeness of different severity classification systems based on lung function characteristics, clinical phenotypes and serum eosinophils and 2) to evaluate the burden of COPD in terms of exacerbations, exacerbation rate and mortality within the Italian COPD registry.
Methods
This was a retrospective, multicenter study based on the preliminary analysis of the data from the novel Italian COPD registry. Patients were retrospectively enrolled from 2014 until 2016 and variables regarding anthropometric, clinical and functional characteristics of patients with a confirmed diagnosis of COPD were reviewed and collected for a cross-sectional analysis. Risk subgroups were based on exacerbation history during the year before entering the study were followed for the incidence of moderate and severe exacerbation during each year of follow up, up to 3 consecutive years. Survival state was assessed at the end of follow up.
Results
In total, 1360 patients (73.4% males) were enrolled in the registry and analyzed. Overall, 37% had very severe airflow obstruction. Inspiratory capacity, diffusion lung capacity for carbon monoxide (DLCO) and the prevalence of emphysema were reflected by the functional Global Initiative for Chronic Obstructive Lung Disease (GOLD) classification only. The proportion of patients with > 200 eosinophils/μl was higher in GOLD
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III-IV stages compared with GOLD I-II (P=0.008). For the longitudinal analysis 1111 patients were included (73% males); 41.5% had a history of exacerbations. The proportion of patients experiencing ≥1 exacerbation during follow-up increased according to pre-defined study risk categories. Overall, by the end of follow-up, 45.5% of patients without a history of exacerbation experienced an exacerbation (31% severe), and 13% died. Compared with survivors, patients that died were older, had worse airflow obstruction and hyperinflation. Severe exacerbations were more frequent in patients that died (23%, vs 10%; P=0.002). Chronic heart failure and ischemic heart disease were independent risk factors for mortality (OR (95%CI: 2.2 (1.4-3.6), P=0.001 and 1.9 (1.2-2.9), P=0.007).
Conclusions
COPD classifications excluding lung function might miss relevant patients’ clinical characteristics such as hyperinflation, DLCO impairment and clinical phenotypes, which have a significant impact on outcomes and disease severity. Patients at low exacerbation risk are at significant risk of future moderate or severe events. Real life data confirm the strong association between mortality and cardiovascular comorbidities in COPD
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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