1,721,235 research outputs found
Extending the Gail Model for Breast Cancer Risk Prediction to Account for Dietary Modifiable Factors in the Italian Population
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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
Impiego di metodi regressivi nello studio della associazione fra differenti modalità di esposizione a mercurio e alcune variabili funzionali.
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Diabetes mellitus and the risk of primary liver cancer
No full textThe relationship between diabetes mellitus and primary liver cancer was investigated in a case-control study conducted in Italy between 1984 and 1996 on 428 cases with incident, histologically confirmed hepatocellular carcinoma, 59 with gallbladder and bile duct cancer, and 1,502 control subjects in the hospital for acute non-neoplastic diseases. Sixty-four cases of hepatocellular carcinoma vs. 87 controls reported a history of diabetes, corresponding to an odds ratio (OR) of 2.3 after allowance for age, sex and area of residence, and of 2.1 [95% confidence interval (CI) = 1.4-3.2] after further allowance for alcohol and tobacco consumption, history of hepatitis and liver cirrhosis, body mass index and history of liver cancer in first-degree relatives. The ORs were similar both for subjects diagnosed with diabetes below age 45, who most likely had insulin-dependent diabetes, and for those diagnosed later, who were likelier to have non-insulin-dependent diabetes. The OR was 2.3 for subjects whose diabetes was diagnosed <5 years before diagnosis of liver cancer, 1.9 for those diagnosed 5-9 years in advance and 2.2 for those diagnosed since 10 years or more. Five cases of gallbladder and bile duct cancer reported a history of diabetes: the corresponding OR was 1.2 (95% CI 0.5-2.9). The OR of hepatocellular carcinoma was 2.4 for males and 2.0 for females, 3.0 for subjects diagnosed with liver cancer under age 60 and 1.8 for those diagnosed at age 60 or over. None of the other covariates considered, including education, history of hepatitis, liver cirrhosis and alcohol drinking showed any meaningful modifying effect or interaction. The potential pathogenic mechanisms include liver alteration-and consequent cell proliferation-in subjects with diabetes. Thus a history of diabetes mellitus could explain about 8% (95% CI 5-11) of cases of liver cancer in this population. (C) 1997 Wiley-Liss, Inc
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