1,720,990 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
Utilization pattern of mineralocorticoid receptor antagonists in contemporary patients hospitalized with acute decompensated heart failure: A single-center experience
No full textBackground Recent studies have broadened the potential use of mineralocorticoid receptor antagonist (MRA) in patients with systolic heart failure after cardiovascular hospitalization. Real-world data on safety and tolerability of MRA initiation during hospitalization for acute decompensated heart failure (ADHF) are lacking. We examined the patterns of utilization of MRAs in patients admitted for ADHF in contemporary clinical practice. Methods and Results We reviewed consecutive hospitalized patients admitted with a primary diagnosis of ADHF from March to June 2011. The treatment patterns of MRA use or discontinuation before, during, and after hospitalization were reviewed and analyzed retrospectively. In the study cohort of 500 patients, 106 patients (21percent) were on MRAs before admission. During hospitalization, preadmission and newly started MRAs were discontinued in 64 out of 177 (36percent), with worsening renal function being the most common identifiable reason. In a multivariate analysis, high admission creatinine was the only significant predictor of MRA discontinuation during hospitalization (P =.01). Of the 394 patients who did not receive MRA before admission, 81 were eligible for MRAs, but only 17 (21percent) were initiated. After a median follow up of 57 days, 21 additional patients discontinued MRAs; of 72 eligible patients for MRA, 55 patients (76percent) were still appropriately taking it. Conclusions Despite recent data, MRAs are still underutilized in patients admitted with ADHF who are otherwise eligible for it. Elevated serum creatinine and worsening of renal function are the most common cause of in-hospital discontinuation, which highlights the importance of meticulous follow-up after MRA initiation. © 2014 Elsevier Inc. All rights reserved.Albert NM, 2009, JAMA-J AM MED ASSOC, V302, P1658, DOI 10.1001-jama.2009.1493; Butler J, 2012, J CARD FAIL, V18, P265, DOI 10.1016-j.cardfail.2012.02.005; Eschalier R, 2013, J AM COLL CARDIOL, V62, P1585, DOI 10.1016-j.jacc.2013.04.086; Ferreira JP, 2014, EUR J INTERN MED, V25, P67, DOI 10.1016-j.ejim.2013.08.711; Goebel Jason A, 2008, Curr Heart Fail Rep, V5, P153, DOI 10.1007-s11897-008-0024-y; Hamaguchi S, 2010, AM HEART J, V160, P1156, DOI 10.1016-j.ahj.2010.08.036; Hernandez AF, 2012, JAMA-J AM MED ASSOC, V308, P2097, DOI 10.1001-jama.2012.14795; Jacob Miriam S, 2011, Curr Heart Fail Rep, V8, P7, DOI 10.1007-s11897-010-0046-0; Krantz MJ, 2011, AM J CARDIOL, V107, P1818, DOI 10.1016-j.amjcard.2011.02.322; Maron BA, 2010, CIRCULATION, V121, P934, DOI 10.1161-CIRCULATIONAHA.109.895235; Pitt B, 2003, NEW ENGL J MED, V348, P1309, DOI 10.1056-NEJMoa030207; Pitt B, 1999, NEW ENGL J MED, V341, P709, DOI 10.1056-NEJM199909023411001; Testani JM, 2010, CIRCULATION, V122, P265, DOI 10.1161-CIRCULATIONAHA.109.933275; Testani JM, 2011, CIRC-HEART FAIL, V4, P685, DOI 10.1161-CIRCHEARTFAILURE.111.963256; Vardeny O, 2012, J AM COLL CARDIOL, V60, P2082, DOI 10.1016-j.jacc.2012.07.048; Yancy CW, 2013, J AM COLL CARDIOL, V62, pE147, DOI 10.1016-j.jacc.2013.05.019; Zannad F, 2011, NEW ENGL J MED, V364, P11, DOI 10.1056-NEJMoa10094923
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
Comorbidity significantly affects clinical outcome after cardiac resynchronization therapy irrespectively of ventricular remodeling
No full textDispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
- …
