1,720,996 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
User's guide to sample size estimation in diagnostic accuracy studies
No full textSample size estimation is an overlooked concept and rarely reported in diagnostic accuracy studies, primarily because of the lack of information of clinical researchers on when and how they should estimate sample size. In this review, readers will find sample size estimation procedures for diagnostic tests with dichotomized outcomes, explained by clinically relevant examples in detail. We hope, with the help of practical tables and a free online calculator (https://turkjemergmed.com/calculator), researchers can estimate accurate sample sizes without a need to calculate from equations, and use this review as a practical guide to estimating sample size in diagnostic accuracy studies
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
User's guide to correlation coefficients
No full textWhen writing a manuscript, we often use words such as perfect, strong, good or weak to name the strength of the relationship between variables. However, it is unclear where a good relationship turns into a strong one. The same strength of r is named differently by several researchers. Therefore, there is an absolute necessity to explicitly report the strength and direction of r while reporting correlation coefficients in manuscripts. This article aims to familiarize medical readers with several different correlation coefficients reported in medical manuscripts, clarify confounding aspects and summarize the naming practices for the strength of correlation coefficients. Keywords: Correlation coefficient, Interpretation, Pearson's, Spearman's, Lin's, Cramer'
Retrospective evaluation poisoning patients in emergency department
No full textGiriş: Çalışmamızda Marmara Üniversitesi Hastanesi Acil Servisi’ne başvuran zehirlenme olgularının demografik ve klinik özelliklerinin tanımlanması amaçlandı. Yöntem: Marmara Üniversitesi Hastanesi Acil Servisi’ne 01.06.2005-31.12.2006 tarihleri arasında başvuran olguların kayıtları geriye dönük olarak tarandı, olguların cinsiyetleri, yaşları, başvuru zamanları, yakınmaları, zehirlenme neden ve yolları, ilaç düzeyi bakılıp bakılmadığı, olgunun acil ve iç hastalıkları servisi ile yoğun bakımda kalış süreleri, psikiyatri konsültasyonu istenip istenmediği önceden düzenlenmiş olgu takip formlarına kaydedildi. Bulgular: 147 zehirlenme olgusu çalışmaya alındı. Olguların toksik madde ile temasları ile acil servise başvuru süreleri ortalama 7,61 saat idi. 78 olgu gündüz, 69 olgu ise gece başvurmuştu. 72 olgunun zehirlenme nedeni ilaç, 63’ünün besin ve 12 tanesinin ise alkoldü. En sık başvuru yakınması bulantı, uykuya eğilim, kusma şeklinde sıralanıyordu. Gelen hiçbir olgunun kanda ilaç düzeylerine bakılamadı. 102 olgu acil serviste, 45 olguda hastaneye yatırılarak tedavi edildi. 65 olgu için psikiyatri konsültasyonu istendi. Tartışma-Sonuç: Hastanemiz acil servisine başvuran zehirlenme olgularından elde ettiğimiz veriler Türkiye’de daha önceden yapılan çalışmalar ile benzer özellikler göstermektedir. Zehirlenmeler daha çok genç kadınlarda ve ilaçlarla olmaktadır. İlaç ile zehirlenen olguların besin ve alkole göre ortalama yaşları daha genç, başvuru süreleri daha erken bulunmuş ve tamamı intihar amaçlıdır. Bu hastalar hastaneye yatırılarak izlenmiş ve çoğuna psikiyatri konsültasyon istenmiştir.Objectives: Purpose of this study was to determine the clinical properties and demographics of the patients admitting to the emergency department with intoxication. Patient and Methods: A retrospective study was conducted with poisoning patients admitted to our ED 1st of June 2005 and 31st of December 2006. Data regarding the age, sex, reason for the intoxication, and presence of psychiatric evaluation were obtained from the patient files. Results: 147 intoxication was admitted to ED. Mean time spent before admission to ED after exposure was 7,61 hours. 78 cases admitted at daytime, 69 cases at night. Agent exposed was drugs at 72 of cases whereas 63 was food and 12 was alcohol. 102 cases were treated in ED and 45 cases admitted to hospital. Psychiatric evaluation was performed on 65 patients. Conclusions: Demographics of the patients admitting to our ED resemble with the findings of other studies reported from Turkey. Intoxication seems to be the problem of young woman and drugs are the most frequent agents. Drug intoxicated cases are younger, report faster to ED and all of them were intended suicide. All of these intentional cases were admitted to a hospital and psychiatric evaluation has been made
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
- …
