1,720,957 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
Population-Based Long-term Cardiac-Specific Mortality Among Patients With Major Gastrointestinal Cancers
Get PDFIMPORTANCE Patients with major gastrointestinal (GI) cancers are at long-term risk for cardiac disease and mortality. OBJECTIVE To investigate the cardiac-specific mortality rate among individuals with major GI cancers and the association of radiation and chemotherapy with survival outcomes in the United States. DESIGN, SETTING, AND PARTICIPANTS This US cohort study included individual patient-level data of men and women older than 18 years with 5 major gastrointestinal cancers, including colorectal, esophageal, gastric, pancreatic, and hepatocellular cancer from 1990 to 2016. Data was extracted from the Surveillance, Epidemiology, and End Results (SEER) national cancer database. Data cleaning and analyses were conducted between November 2020 and March 2021. EXPOSURES Patients received chemotherapy, radiotherapy, or a combination of adjuvant therapy for major GI cancers. MAIN OUTCOMES AND MEASURES The primary outcome was cardiac-specific mortality. Examined factors associated with cardiac mortality included age, sex, race, tumor location, tumor grade, SEER stage, TNM (seventh edition) staging criteria, cancer treatment (ie, the use of radiation, chemotherapy, or surgery), survival months, and cause of death. RESULTS A total of 359 032 patients (mean [SD] age at baseline, 65.1 [12.9] years; 186 921 [52.1%] men) with GI cancers were analyzed, including 313 940 patients (87.4%) with colorectal cancer, 7613 patients (2.1%) with esophageal cancer, 21 048 patients (5.9%) with gastric cancer, 7227 patients (2.0%) with pancreatic cancer, and 9204 patients (2.6%) with hepatocellular cancer. Most cancers were localized except pancreatic cancer, which presented with regional and distant involvement (3680 cancers [50.9%]). Overall, all major gastrointestinal tumors were associated with increased risk of cardiac mortality compared with noncardiac mortality (median survival time: 121 [95% CI, 120-122] months vs 287 [95% CI, 284.44-290] months). Patients with hepatocellular cancer had the lowest cardiac-specific median survival time (98 [95% CI, 90-106] months), followed by pancreatic cancer (105 [95% CI, 98-112] months), esophageal cancer (113 [95% CI, 107-119] months), gastric cancer (113 [95% CI, 110-116] months), and colorectal cancer (122 [95% CI, 121-123] months). At 15 years of follow up, the use of only chemotherapy, only radiation, or radiation and chemotherapy combined was associated with poor survival rates from cardiac causes of death (eg, colorectal: chemotherapy, 0 patients; radiation, 1 patient [1.9%]; radiation and chemotherapy, 3 patients [2.7%]). CONCLUSIONS AND RELEVANCE These findings suggest that among patients with major gastrointestinal cancers, cardiac disease is a significant cause of mortality. The use of only chemotherapy, only radiation, or both was associated with higher cardiac mortality
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
Predictors of lymph node metastasis in T1 colorectal cancer in young patients: Results from a national cancer registry
Get PDFThe objective of this study is to fill the knowledge gap by examining predictors of lymph node metastasis (LNM) in young patients, less than 45 years, using a national cancer registry. Methods: Patients diagnosed with T1 colorectal cancer were identified in the Surveillance, Epidemiology, and End Results registry. In total, 692 patients with T1 colorectal cancer were identified. Most tumors occurred in white race (77.7%), between 40 and 44 years of age (49.4%), with grade III tumor differentiation (59.8%) and 1 to 1.9 cm size (32.2%), and were left-sided tumors (61.1%). The overall rate of LNM was 22.5% (n = 149). LNM was associated with tumor grade IV (undifferentiated) (odds ratio (OR) 2.94, CI: 1.06–8.12; p = 0.038), and increasing tumor size (1 cm–1.9 cm: OR 2.92, CI: 1.71–4.97, p < 0.001; 2.0 cm–2.9 cm: OR 2.00, CI: 1.05–3.77, p = 0.034; and ≥3.0 cm: OR 2.68, CI: 1.43–5.01, p = 0.002). Five-year cancer-specific survival for patients with LNM was 91% and for patients without LNM this was 98%. Adjusted cox proportion models showed that LNM was associated with a four times higher rate of mortality (hazard ratio (HR) 4.43, CI: 1.27–15.52, p = 0.020). In this population-based analysis of patients with T1 colorectal cancer, tumor size and grade were significant predictors of LNM
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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