1,721,046 research outputs found
Jackknife Empirical Likelihood-based inference for S-Gini indices
Full text linkWidely used income inequality measure, Gini index is extended to form a
family of income inequality measures known as Single-Series Gini (S-Gini)
indices. In this study, we develop empirical likelihood (EL) and jackknife
empirical likelihood (JEL) based inference for S-Gini indices. We prove that
the limiting distribution of both EL and JEL ratio statistics are Chi-square
distribution with one degree of freedom. Using the asymptotic distribution we
construct EL and JEL based confidence intervals for realtive S-Gini indices. We
also give bootstrap-t and bootstrap calibrated empirical likelihood confidence
intervals for S-Gini indices. A numerical study is carried out to compare the
performances of the proposed confidence interval with the bootstrap methods. A
test for S-Gini indices based on jackknife empirical likelihood ratio is also
proposed. Finally we illustrate the proposed method using an income data
Teoremas central del límite para el s-gini y el coeficiente de theil
Full text linkSe usa el Proceso Húngaro (Komlós et al. 1975) para derivar la normalidad asintótica del S-Gini; Este método es muy interesante ya que puede ser usado para demostrar la normalidad asintótica de otros coeficientes usados para medir la desigualdad de ingresos como el de Theil. Se consiguen expresiones explícitas para la media y la varianza del S-Gini y del coeficiente de Theil. Finalmente, se realiza un estudio de simulación, en el que se compara el rendimiento de la aproximación asintótica propuesta y del método Bootstrap Suavizado.The Hungarian Construction (Komlós et al. 1975) is used for getting a proof of asymptotic normality of S-Gini coefficient; this method is very interesting because it can be used to check asymptotic normality of other income inequality measures as Theil coefficient. Besides, explicit expressions of asymptotic means and variances are given for S-Gini and Theil estimators. Finally, to illustrate the performance of obtained results, we carry out a simulation study comparing the asymptotic and Smoothed Bootstrap approximations
Inference for S-Gini Poverty Indices
Full text linkKakwani [Econometrica, 48, 2 (1980), 437-446)] introduced the S-Gini poverty indices as a generalization of Sen’s poverty index. I propose a sample estimator for the indices and establish its asymptotic normality under weak conditions. An explicit variance formula is presented. The poverty line is allowed to depend on the income distribution function.
Central Limit Theorems for S-Gini and Theil Inequality Coefficients Teoremas central del límite para el S-Gini y el coeficiente de Theil
No full textThe Hungarian Construction (Komlós et al. 1975) is used for getting a proof of asymptotic normality of S-Gini coefficient; this method is very interesting because it can be used to check asymptotic normality of other income inequality measures as Theil coefficient. Besides, explicit expressions of asymptotic means and variances are given for S-Gini and Theil estimators. Finally, to illustrate the performance of obtained results, we carry out a simulation study comparing the asymptotic and Smoothed Bootstrap approximations.Se usa el Proceso Húngaro (Komlós et al. 1975) para derivar la normalidad asintótica del S-Gini; Este método es muy interesante ya que puede ser usado para demostrar la normalidad asintótica de otros coeficientes usados para medir la desigualdad de ingresos como el de Theil. Se consiguen expresiones explícitas para la media y la varianza del S-Gini y del coeficiente de Theil. Finalmente, se realiza un estudio de simulación, en el que se compara el rendimiento de la aproximación asintótica propuesta y del método Bootstrap Suavizado
The operation of ITS in public transport service: guidelines for Public Authorities and operators
No full textITS (Intelligent Transport Systems) has increasingly captured the interest of the Public Administrations (Transport Executives, Mobility Agencies, Municipalities, etc) for mobility governance and Public Transport (PT) services (and for the emerging concept of “Smart City”). The overall aim of the paper is to show that the implementation of ITS technology itself is not enough to increase transport services performances as the objectives of ITS implementation and operational and organizational procedure impacts on system specifications. ITS for PT services (fleet control- AVM, e-ticketing systems and
user information) are described outlining the role of AVM as a key system for service control and data production. The current market situation is analysed from the demand and offer sides, in order to outline and explain why sometimes ITS applications do not achieve the planned objectives. Some examples of the cross-relations among stakeholders' objectives and needs, service operation and system functionalities are provided. Finally the importance of the implementation of a feasibility study for guaranteeing full operating systems is described in terms of contents and actions
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
In vitro 5-phosphoribosyl-1-pyrophosphate independent salvage of ribo- and deoxyriboadenine nucleotides in Bacillus cereus
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