1,720,983 research outputs found
Budget-Constrained Optimal Insurance with an Upper Limit on the Insurer's Exposure
Get PDFThis thesis studies the problem of budget-constrained optimal insurance indemnification when the insurer imposes an upper limit on disbursement. In balancing the trade-off between the cost of paying the insurance premium and the benefit of receiving the indemnity, the risk-averse insured aims to maximize his/her subjective expected utility of terminal wealth, subject to a budget constraint, and to the constraint that the insurer has an upper bound on the indemnification disbursement. We assume that the insured's subjective probability measure is obtained from the insurer's probability measure by a transformation such as in Furman and Zitikis (2009), and that the insurer uses a distortion-type premium principle. We also assume that the insurer can observe the realized loss by incurring a state-verification cost. We show that in the presence of an upper limit on disbursement, the optimal indemnification function is a limited variable deductible. We then examine three numerical applications, and we illustrate the optimal indemnity and retention function in each case
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
Cost-Efficient Contingent Claims with Choquet Pricing
Get PDFWe examine a problem, in which an investor seeks the cheapest contingent claim that achieves a minimum performance subject to a maximum allowed risk exposure. Specifically, our problem minimizes a non-linear cost functional, subject to both a minimum performance measure and a maximum risk measure, where all expectations are taken in the sense of Choquet. Solutions to our problem are called cost-efficient claims, and possess a desirable monotonicity property; the claims are anti-comonotonic with respect to the underlying asset, and therefore a hedge against its risk. By viewing our problem in the context of convex optimization, we apply a Karush-Kuhn-Tucker theorem to give necessary and sufficient conditions for cost efficiency. Such conditions also hold when the distortion functions are assumed to be absolutely continuous, but not necessarily continuously differentiable. This allows us to consider a broader set of risk measures, including the popular conditional value at risk (a.k.a. the expected shortfall). Under some additional assumptions, we explicitly characterize cost- efficient claims in closed-form, thereby extending the results of Ghossoub. Finally, a numerical example is provided to illustrate our results in full detail
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
Monotone equimeasurable rearrangements with non-additive probabilities
Get PDFIn the classical theory of monotone equimeasurable rearrangements of functions, “equimeasurability” (i.e. the fact the two functions have the same distribution) is defined relative to a given additive probability measure. These rearrangement tools have been successfully used in many problems in economic theory dealing with uncertainty where the monotonicity of a solution is desired. However, in all of these problems, uncertainty refers to the classical Bayesian understanding of the term, where the idea of ambiguity is absent. Arguably, Knighitan uncertainty, or ambiguity is one of the cornerstones of modern decision theory. It is hence natural to seek an extension of these classical tools of equimeasurable rearrangements to situations of ambiguity. This paper introduces the idea of a monotone equimeasurable rearrangement in the context of non-additive probabilities, or capacities that satisfy a property that I call strong nonatomicity. The latter is a strengthening of the notion of nonatomicity, and these two properties coincide for additive measures and for submodular (i.e. concave) capacities. To illustrate the usefulness of these tools in economic theory, I consider an application to a problem arising in the theory of production under uncertainty
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