1,721,137 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
Conformity with clinical practice guidelines for Management of patients with sarcoma: a costeffectiveness assessment in two European regions.
No full textObjectives: Sarcomas are rare tumors (1-2% of all cancers) originating from connective tissue, skin, retroperitoneum, bone, and viscera. The rarity of the disease, the variety of histological types or locations and the heterogeneity of prognostic factors account for the difficulty in acquiring sufficient personal experience. Moreover, the lack of graduate or post-graduate medical teaching makes it difficult for physicians outside centres of excellence to provide appropriate sarcoma management. Therefore, a cost-effectiveness analysis was undertaken in Veneto and Rhône-Alpes in order to evaluate the impact of conformity of clinical pathway to Clinical Practice Guidelines on prognosis of sarcoma. The general objective of this research is to analyze during the whole clinical pathway of patients within the healthcare system the relationships between (i) the management strategies, including conformity with clinical practice guidelines; (ii) the health outcomes, e.g. the disease free survival; and (iii) the resources used.
Methodology :
Study sample: patients (age 15 years) with histological diagnosis of primary malignant sarcoma of all histological subtypes except osteosarcoma; sarcomatoid carcinoma; mesothelioma; neuroblastoma; paraganglioma. Other inclusion criteria were (i) in Veneto: patients diagnosed and treated in the public hospitals of the region from January 2007 to December 2007; (ii) in Rhône-Alpes: patients diagnosed and treated patients at the University Hospital of Lyon and/or at the Cancer Centre of the Rhône-Alpes region between March 2005 and February 2006;
Source of information: hospital records (patients’ age, sex, comorbidities, etc.). Conformity to Clinical Practice Guidelines (CPGs): assessed by two physicians from the Cancer Center Léon Bérard and the University of Padova.
Costs assessment: hospital’s point of view; time horizon ranging from diagnosis to the end of follow-up or at the event’s date (relapse, diagnosis of another cancer, death). Costs expressed in € 2009; discounting rate: 4%.
Effectiveness: Overall survival and disease free survival.
Incremental cost-effectiveness Ratios (ICERs): ICERs was expressing the cost per life year gained and per relapse free year gained.
Statistical analysis: descriptive statistics were used to analyze patient and tumor characteristics and costs; a Cox-regression model was used to fit conformity to CPGs on survival after adjusting for grade (II and III vs I); the uncertainty surrounding the ICERs was captured by a probabilistic sensitivity analysis: 1000 replications were obtained by non parametric bootstrap methods. In each quadrant of the cost-effectiveness plane, the probability that the true ICER was in the quadrant under consideration was specified by a percentage. The external ellipse defines the confidence region at level 95%, and the internal ellipse at level 50%. The relationship between the cost of each treatment and a range of explanatory variables including conformity to CPGs was estimated using standard linear models with Ordinary Least Squares (OLS) when the cost variable was continuous, and Tobit regression when the cost variable was censored All statistical analysis were performed using STATA software (version 11.0) and Gauss software (version 9.0).
ain content:
Conformity with CPG: 118 out of 219 patients (54%) have an overall phase conformed with CPG. The conformity of single phase ranged from 74% for chemotherapy to 63% for follow-up. Differences about conformity group were detected for grade (p=0.01) and histological subtype (p=0.03).
Outcomes: overall survival reached 2,3 years when treatments were conformed with CPG versus 2,4 years when treatments were not conformed with CPG (p=0.79, log-rank test). Disease free survival reached 2,1 years when treatments were conformed with CPG versus 2,1 years when treatments were not conformed with CPG (p=0.91, log-rank test).
Costs: The average costs of overall sarcoma treatment reached €23,571 (n=118) and 27,019€ (n=101) when treatments were conformed and not conformed with CPG respectively.
Incremental cost-effectiveness Ratios: As treatments not conformed with CPG were more costly and less effective than treatments conformed with CPG, no conformity with CPG was strictly dominated for disease free survival. When handling uncertainty, since the origin of the cost-effectiveness plane was included in the 95% confidence ellipses, the probabilistic sensitivity analysis did not permit to confirm these results. The probability that the true ICER fell in the southeast quadrant (i.e. treatment conformed with CPG is less costly and more effective compared to treatment not conformed with CPG) is 48%.
Econometrics results: conformity of diagnosis decreased the cost surgery (p=0.03). Conformity of surgical resections increases the cost of surgery (p=0.01) and decreased the cost of initial treatment (p=0.05) and overall treatment (p=0.05). Conformity of chemotherapy decreased the cost of radiation therapy (p=0.05).
Expected original contribution: In the context that few studies have examined patient clinical outcomes and costs in relation to conformity with CPG, this cost-effectiveness analysis shows that conformity of the initial treatment of sarcoma with CPG seems to be more expensive in the short run but reduce hospital care expenditures at three years post-diagnosis. This study has never been neither presented nor published previously
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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