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Evaluating the Integration of contiguous discontinuous Markets
No full textThis paper applies the concepts of structural models of markets, market integration, and market discontinuity to show that discontinuous markets alter the integration characteristics of continuous markets. When analyzing systems of contiguous markets, some of which are discontinuous, it appears that the continuous markets are less well integrated when the discontinuous markets are operating than when they are not operating. Key words: alfalfa hay, continuous markets, discontinuous markets, integration tests, spatial market integration. The role of discontinuous markets (those in which transactions do not occur during some time pe-riods) has been neglected in the debate over how to define a "market. " Many economic sectors include discontinuous markets. For example, markets for many agricultural commodities, such as fresh fruits and vegetables, are seasonal, or more generally discontinuous in that transac-tions occur during part of the annual marketing cycle and are absent during the remainder of the cycle. Because of differences in production practices (such as irrigating in one area but not another) or climatic factors (caused by differ-ences in elevation), discontinuous and continu-ous markets for the same commodity may op-erate in close spatial proximity. When both continuous and discontinuous markets operate near one another, information from and spatial arbitrage with the discontin-uous market may affect the continuous market and vice versa. However, when the discontin-uous markets are not operating, price informa-tion from and spatial arbitrage opportunities with the discontinuous markets cannot affect the con-tinuous market, because this information and these opportunities are not available. In short, when a discontinuous market is part of a spatial system, the degree of integration of the contin-Roger A. Dahlgran is an associate professor of agricultural eco-nomics. University of Arizona. Steven C. Blank is an extensio
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
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
COVER AND CONTENTS PAGES
Get PDFThis section includes: Front Cover; Editorial Information; Contents Pages; Steven C. Blank, WAEA President, 2001-200
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
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COVER AND CONTENTS PAGES
Get PDFThis section includes: Front Cover; Editorial Information; Contents Pages; Steven C. Blank, WAEA President, 2001-200
COVER AND CONTENTS PAGES
No full textIncludes: Front Cover; Editorial Information; Contents Pages; Steven C. Blank, WAEA President, 2001-2002
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
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