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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
Miocardio a rischio dopo infarto miocardico acuto trattato con fibrinolisi: rilevamento mediante ecocardiografia da sforzo e significato clinico-prognostico.
No full textVariations 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
Usefulness of echocardiography in the prognostic evaluation of non-Q-wave myocardial infarction
No full textPatients with non–Q-wave myocardial infarction (MI)
are a heterogeneous population with a wide range of
coronary disease severity and extent of myocardial necrosis,
showing, therefore, different electrocardiographic
findings and different outcomes. To evaluate the
role of echocardiography in the management of non–Qwave
MI patients, 192 consecutive patients without previous
MI were studied (78 with ST segment elevation, 56
with ST depression and 58 without ST modifications). All
patients underwent 2-dimensional echocardiography
(16-segment model) within 24 hours of admission to the
coronary care unit. Wall-motion abnormalities, wallmotion
score index, ejection fraction, and end-diastolic
and end-systolic volumes were evaluated. In 35 patients,
death, reinfarction, recurrent angina, or severe
heart failure occurred during the in-hospital phase,
whereas the remaining 157 patients had a good outcome.
Patients with a poor prognosis were older (68 6
6 vs 59 6 5 years, p <0.01), had a worse left-ventricular
function (wall-motion score index 1.4 6 0.4 vs 1.25 6 0.3, p <0.05; end-systolic volume 54 6 25 vs
38 6 12 mL/m2
, p <0.01; ejection fraction 50 6 10 vs
58 6 8%, p <0.01), and presented more frequently with
ST segment depression (49 vs 25%, p <0.01). The positive
and negative predictive values for early clinical
events were, respectively: ST segment depression 0.30
and 0.87; wall-motion abnormalities in >3 segments
0.28 and 0.86; wall-motion score index >1.33 5 0.28
and 0.87; end-diastolic volume >46 mL/m2 5 0.49 and
0.91; ST segment depression and wall-motion abnormalities
in >3 segments 0.60 and 0.88. These results
underline the usefulness of echocardiography in the
early risk stratification of non–Q-wave MI patients, together
with electrocardiographic data. Patients with ST
segment depression and more extensive wall-motion
abnormalities are at higher risk and their management
needs a more aggressive approach
[Stress echocardiography in the study of the warm-up phenomenon]. FT L'ecocardiografia da sforzo nello studio del fenomeno del warm-up.
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
Miocardio a rischio dopo infarto miocardico acuto trattato con fibrinolisi: valutazione con ecocardiografia da sforzo e significato prognostico
No full text- …
