1,720,956 research outputs found
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
Scelte di portafoglio. Approccio media-varianza stati di natura continui
Get PDFL'obiettivo di queste note è evidenziare il metodo di ottimizzazione del portafoglio unico per cui l'investitore massimizza la sua funzione di utilità in media e varianza del portafoglio rispetto al vincolo della frontiera efficiente dei possibili pesi in cui le attività finanziarie disponibili sono detenute nel portafoglio. Tale frontiera sarà una retta, la "capital market line", se esiste un'attività risk-free o una curva se vi sono solo attività rischiose. Il CAPM non è altro che il primo caso, ma dove la CML è tangente alla frontiera efficiente delle attività rischiose. Essendo tale punto il portafoglio dominante dovrà essere l'indice di mercato. Tale tangenza definisce i "beta" come i coefficienti di regressione del rendimento di un'attività finanziaria qualunque verso l'eccesso di rischio presento sul mercato. Di conseguenza tale regressione calcola il rendimento medio atteso per un'attività finanziaria che abbia correlazione "beta" verso il rischio di mercato.The aim of these notes is to highlight the method of portfolio optimization, when the investor maximizes his mean-variance utility function subject to the constraint represented by the efficient frontier of the possible weights in which the available financial assets available are held. This frontier will be a straight line, the "capital market line", when there is a risk-free asset or a curve when there are only risky assets. The CAPM is nothing else than the first case, but where the CML is tangent to the efficient frontier of risky activities. Since the tangency condition defines the dominant portfolio, this must be the market index. This tangency defines also the "betas" as the regression coefficients of the return of any financial asset towards the excess risk present on the market. Consequently, this regression calculates the expected average return for a financial asset that has a "beta" correlation with market risk
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
Lezioni di scelta in condizioni di incertezza e asset pricing. Stati di natura discreti e mercati completi
No full textIn queste note si cerca di evidenziare come l'asset pricing, nel contesto di stati di natura discreti emercati completi, sia un metodo per spostare ricchezza attraverso gli stati di natura, per ottenere un consumo il più possibile omogeneo nei diversi stati di natura. L'obiettivo è costruire il sistema di equazioni da risolvere per le incognite e come meccanizzare il modello in semplici algoritmi risolvibili dal computer. Vengono esposte le due strategie di soluzioni equivalenti: a ritroso (backward) e in avanti (forward, tramite l'equazione di Bellman). I problemi considerati vanno dal caso più semplice di attività finanziarie "pure" ai casi di attività finanziarie "complesse" che danno luogo a rendimenti in più o tutti gli stati di natura.In these lecture notes I try to emphasize how asset pricing in discrete states of nature and complete markets, is a way to move wealth around states of nature in order to smooth consumption. The aim is to construct the system of equation to be solved for unknowns and how to mechanize the model into simple software algorithms. Two solution strategies are presented: backward and forward, through Bellman equation. The problems to be solved start from the easy case of pure assets to the case of complex assets having yields in many or all states of nature
Online International Conference on Tax Compliance: New Methodological and Empirical Approaches. October 28-29 2020.
No full textIn this work I clarify VAT evasion incentives through a game theoretical approach. Traditionally, evasion has been linked to the decreasing risk aversion in higher revenues (Allingham and Sandmo (1972), Cowell (1985) (1990)). I claim tax evasion to be a rational choice when compliance is stochastically more expensive than evading, even in absence of controls and sanctions. I create a framework able to measure the incentives for taxpayers to comply. The incentives here are deductions of specific VAT documented expenses from the income tax.
The issue is very well known and deduction policies at work in many countries. The aim is to compute the right parameters for each precise class of taxpayers. VAT evasion is a collusive conduct between the two counterparts of the transaction. I therefore first explore the convenience for the two private counterparts to agree on the joint evasion and to form a coalition. Crucial is that compliance incentives break the agreement among the transaction participants' coalition about evading. The game solution leads to boundaries for marginal tax rates or deduction percentages, depending on parameters, able to create incentives to comply The stylized example presented here for VAT policies, already in use in many countries, is an attempt to establish a more general method for tax design, able to make compliance the "dominant strategy", satisfying the "outside option" constraint represented by evasion, even in absence of audit and sanctions. The theoretical results derived here can be easily applied to real data for precise tax design engineering
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
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