1,721,015 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
Ethical screening and financial performance : the case\ud of Islamic equity funds
No full textWhether ethical screening affects portfolio\ud
performance is an important question that is yet to be\ud
settled in the literature. This paper aims to shed further\ud
light on this question by examining the performance of a\ud
large global sample of Islamic equity funds (IEFs) from\ud
1984 to 2010. We find that IEFs underperform conventional\ud
funds by an average of 40 basis points per month,\ud
consistent with the underperformance hypothesis. In line\ud
with popular media claims that Islamic funds are a safer\ud
investment, IEFs outperformed conventional funds during\ud
the recent banking crisis. However, we find no such outperformance\ud
for other crises or high volatility periods.\ud
Based on fund holdings-based data, we provide evidence of\ud
a negative curvilinear relation between fund performance\ud
and ethical screening intensity, consistent with a return\ud
trade-off to being more ethical
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
Analyst coverage and IPO management forecasts
No full textGiven the all-importance of analyst coverage for IPO firms, we examine the interaction between the initiation of analyst coverage and management forecast disclosure in IPO prospectuses. We find that IPO firms that provide a prospectus forecast are more likely to receive coverage (and earlier), particularly from lower quality analysts. The depth of coverage, measured by the number of analysts issuing a recommendation on the firm, is also greater for forecasters. These results hold after controlling for potential endogeneity due to simultaneity in management decision to provide a forecast and analysts' decision to cover the firm. Further analyses show that reputation concerns matter to analyst coverage decisions — conditional on firms providing a prospectus forecast, the likelihood of receiving coverage decreases with the magnitude of the absolute management forecast error. There is evidence of quid pro quo where the analyst working for the underwriter of the IPO aligns her forecast with the management forecast more than unaffiliated analysts. Insofar as management forecasts are important to coverage decision and analyst coverage is valuable, our research has important implications for strengthening the safe harbour provision for prospectus forecasts in litigious environments such as that in the U.S
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
Dispelling 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
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