1,720,969 research outputs found
On Gerber-Shiu equation with Erlang claims
No full textIn the classical Poisson risk model, we find an analytical solution of Gerber-Shiu equation when the claim size distribution is an Erlang, by mean of Laplace transform
On matrix-exponential distributions in Risk Theory
No full textIn this paper, a particular class of matrix-exponential distributions is described, also with respect to its use in risk theory, namely phase-type distributions. Phase-type distributions have the important advantage of being suitable for approximating most of other distributions as well as being mathematically tractable.
After a review on phase-type distributions and their properties, it is illustrated a possible use in risk theory. Modelling both interarrival claim times and individual claim sizes with this class of distributions an explicit formula for the probability of ultimate ruin is given
Un procedimento di risoluzione dell’equazione integro-differenziale di Gerber-Shiu
No full textNell’ambito del modello classico della teoria del Rischio, con un processo dei sinistri poissoniano, troviamo una soluzione analitica dell’equazione integro-differenziale di Gerber-Shiu nell’ipotesi in cui la distribuzione delle somme a rischio sia una Erlang riconducendo il problema alla risoluzione di un’equazione differenziale
Ruin probability approximation for a class of renewal processes with heavy tails
No full textThis paper examines an integro-differential equation of the survival probability d(u) for a class of risk processes in which claims occur as an ordinary renewal process. Specifically, according to the model proposed by Dickson, claims are assumed to occur as an Erlang process. We determine d(u) by using an exponential claim size distribution, thus comparing the results to those obtained from the classical Cramér-Lundberg model. After having transformed the integro-differential equation into an integral equation, we find an approximate solution for d(u). We then test it in exponential cases. Furthermore, we consider the case of large claims characterized by heavy-tailed claim size distributions. The approximate solution found for d(u) also applies to certain subexponential distributions. Finally, we obtain an expression for the asymptotic behaviour of when the claim size distribution has a regularly varying tail
Good Co(o)p or bad Co(o)p? redistribution concerns and competition in credit markets with imperfect information
No full textNon-profit organizations (NPOs), such as financial cooperatives, have a longstanding tradition in advanced market economies. We develop a model of 'mixed creditmarkets'where pure for-profit institutions (e.g. commercial banks) can coexist with financial NPOs which feature a concern for inter-member surplus redistribution (e.g. credit cooperatives) and enjoy privileged borrower-specific information vis-à-vis their for-profit peers, while facing higher funding costs. We formally investigate market competition between the two alternative financial organizations both offering contractswhose terms entail cross subsidization. We argue that heterogeneity in organizational models can explain stable coexistence under competitive conditions, and also help us interpret the variety ofmarket outcomes- in terms of e.g. overall coverage and market shares - as documented in modern financial systems. Importantly, the viability of redistribution-oriented NPOs is shown not to rest on under-investment issues or concerns about market power, for they can successfully operate in markets where credit rationing never arises
The School to Work Transitions Failures and the NEETs
No full textThis paper investigates on the most significant aspects of the school to work transition that is the
period from the end of education to the attainment of the first regular job. During this period, young
people are usually in the NEET status that is Not in Employment, Education and Training. The length
of this period and therefore the time experienced as NEETs depends on many factors, such as the
individual characteristics and the aspects connected with the education system, Institutions and labour
market. In order to better understand these dynamics, in this study we analyze young people by age
and gender according to their professional status in a selection of European countries. Results
highlight remarkable differences in the patterns concerning men and women, especially after the 24
years, and the structural nature of the NEET phenomenon in the Mediterranean countries of Italy and
Spain
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
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
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
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