1,721,268 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
A Maximum-Entropy Fuzzy Clustering Approach for Cancer Detection When Data Are Uncertain
No full textEvaluation of a barriers to discharge screening in a mental health impatient unit
No full textBACKGROUND: People admitted to inpatient mental health units have a variety of social problems such as homelessness, lack of funding or poor social support. This can be reflected in longer length of stay. The goal of the study is to assess the predictive validity of the Barriers to Discharge questionnaire scores on length of stay in a Mental Health inpatient unit. METHODS: Two thousand three hundred fifty-five inpatients were analyzed with a mean age of 38.9±16.0 years, 51% were male and the mean log of length of stay in days was 1.23±1.11. The barrier to discharge score continuous variable was transformed in categorical variable, and the categories were fixed as follows: 0-121 points: low risk; 122-199 points: medium-low risk; 200-274 points: medium-high risk; 275-817 points high risk, according to the definition of the creators of the questionnaire. A multiple linear regression model was used with log of Length of stay in days as dependent variable. RESULTS: People belonging to the “low risk” category showed a significantly lower length of stay compared to the other higher risk categories. CONCLUSIONS: The Barriers to Discharge tool, although promising, needs to be tested in other contexts and using mental health diagnosis as variable, to see whether it can be a useful predictor of severity of people suffering from mental problems, which is reflected in the length of stay in an inpatient unit
Rapid palatal expansion (RPE): Meta-analysis of long-term effects
No full textObjects: Rapid palatal expansion (RPE) is a widespread orthopaedic procedure used in several clinical situations. The aim of the study was to provide a systematic review and meta-analysis of transverse intercanine and intermolar width changes after RPE and long-term effects. Setting and Sample Population: A systematic literature search was conducted until January 2018 on original studies with RPE treatment. Material and Methods: Intercanine and intermolar distance were measured at the start of RPE (T1, median age 9.2 years) and at the end of treatment (T2). The long-term evaluation was conducted on a subset of articles with 5-year follow-up (T3). Results: Eighteen studies T1-T2 and 5 studies T3 were selected. Regarding the intercanine distance, the RPE resulted in a gain of space T1-T2 of 3.73 mm with a significant heterogeneity (P < 0.0001; I2 = 94.21%) and a relapse T2-T3 of −0.81 mm with a significant heterogeneity (P < 0.0001; I2 = 95.8%); the overall gain of space was 2.91 mm. Regarding the intermolar distance, the RPE resulted in a gain of space T1-T2 of 4.85 mm with a significant heterogeneity (P < 0.0001; I2 = 92.41%) and a relapse T2-T3 of −0.47 mm with a significant heterogeneity (P < 0.0001; I2 = 87.5%); the overall gain of space was 4.38 mm. Meta-regression analysis showed that at younger age, the amount of anterior expansion is similar to posterior. With increasing age, the anterior opening diminishes significantly more than the posterior, being half of the posterior at 15 years. Conclusion: Because long-term results were obtained with simultaneously fixed appliances and long upper retention, RPE should be carefully considered before using
Baseline characteristics and hormonal pattern in Klinefelter syndrome patients: first data from the Klinefelter Italian Gruop (KING).
No full textAn estimation of the prevalence of occult HBV infection in Western Europe and in Northern America: A meta-analysis
No full textData on the prevalence of occult HBV infection (OBI) in Western Europe and in Northern America are few; hence, we conducted a systematic review and meta-analysis. All studies included had to fulfil the following inclusion criteria: (a) they investigated the prevalence of OBI (HBV DNA in liver tissue in HBsAg-negative subjects), (b) were carried out in Western Europe and in Northern America; (c) were available as a full-text manuscript, (d) written in English and (e) published up to December 2018. The exclusion criteria were as follows: (a) meta-analyses, letters, reviews, meeting abstracts or editorial comments; (b) studies investigating HBsAg-positive patients; (c) those investigating OBI outside Western Europe and in Northern America; and (d) to avoid small sample bias in the random-effects model, those enrolling less than five subjects. Thirty-four studies met the inclusion criteria, allowing a meta-analysis on 2729 patients. The overall prevalence of OBI was 34% (95% CI = 26%-42%), 28% (CI 95%: 12%-48%) in 329 subjects without chronic liver disease and 35% (95% CI 26%-44%) in 2400 patients with chronic liver disease. The prevalence of OBI was 51% (95% CI 40%-62%) in the 823 anti-HBc-positive subjects and 19% (95% CI 10%-30%) in the 1,041 anti-HBc-negative subjects. Evaluating the data from 17 studies comparing anti-HBc-positive and negative subjects, the prevalence of OBI was higher in the 641 anti-HBc-positive subjects than in the 1041 anti-HBc-negative (prevalence ratio = 2.29; 95% CI = 1.61-3.26, P <.001). This meta-analysis showed that in HBsAg-negative subjects the prevalence of OBI was high and was associated with anti-HBc positivity
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