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Investigating Salmon Price Volatility
Get PDFAn understanding of the structure of price volatility is of great interest since this is a major contributor to economic risk in the salmon industry. The volatility process in salmon prices was analyzed based on weekly price data from 1995 to 2007. The Generalized Autoregressive Conditional Heteroskedasticity (GARCH) model was used to test for volatility clustering and persistence of volatility for prices. We find evidence for and discuss the degree of persistence and reversion in the salmon price volatility. We further find that the usual assumption of an independent zero mean normally distributed error term is not satisfactory when describing the salmon price process.KEYWORDS: Fisheries economics, Price risk, Salmon aquaculture, Price volatility, Salmon prices, Economic ris
The Behaviour of Salmon Price Volatility
Get PDFSalmon prices exhibit substantial volatility. An understanding of the structure of volatility is of great interest since this is a major contributor to economic risk in the salmon industry. The volatility process in salmon prices was analysed based on weekly price data from 1995 to 2007. The Generalized Autoregressive Conditional Heteroskedasticity (GARCH) model was used to test for volatility clustering and persistence of volatility for prices. We find evidence for and discuss the degree of persistence and reversion in salmon price volatility. Further, we find increased volatility in periods of high prices. For the industry this means that larger expected profits more often than not come at a tradeoff of greater price risk.Price risk, salmon aquaculture, salmon prices, volatility, Marketing, Research and Development/Tech Change/Emerging Technologies, Research Methods/ Statistical Methods, C22, Q21, Q22,
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
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Crisis averted: Cross-market reallocation during the great trade collapse
Get PDFThis article investigates cross-market reallocation of trade to mitigate negative effects of large economic shocks. We propose a simple measure of trade reallocation and apply it to Norwegian exports during the great trade collapse following the financial crisis in 2008–2009. The results indicate statistically significant cross-market reallocation of trade away from markets hit hard by the crisis as measured by GDP/growth. Norwegian exports declined by 16.9% from 2008 and 2009. Without reallocation, the decline would have been between 1.6 and 3.8 percentage points greater. Successful reallocation at the firm level is done primarily along the intensive margin, by shifting physical products towards less affected markets within their pre-crisis trade networks.publishedVersio
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