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Best invariant and minimax estimation of quantiles in finite populations. Center for Rationality DIscussion paper 553
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Stochastic Precedence and Minima Among Dependent Variables
Full text linkThe notion of stochastic precedence between two random variables emerges as a relevant concept in several fields of applied probability. When one consider a vector of random variables X1,..,Xn, this notion has a preeminent role in the analysis of minima of the type minj∈AXj for A ⊂{1,...n}. In such an analysis, however, several apparently controversial aspects can arise (among which phenomena of “non-transitivity”). Here we concentrate attention on vectors of non-negative random variables with absolutely continuous joint distributions, in which a case the set of the multivariate conditional hazard rate (m.c.h.r.) functions can be employed as a convenient method to describe different aspects of stochastic dependence. In terms of the m.c.h.r. functions, we first obtain convenient formulas for the probability distributions of the variables minj∈AXj and for the probability of events {Xi=minj∈AXj}. Then we detail several aspects of the notion of stochastic precedence. On these bases, we explain some controversial behavior of such variables and give sufficient conditions under which paradoxical aspects can be excluded. On the purpose of stimulating active interest of readers, we present several comments and pertinent examples
El cielo del justo observador. Constantino Malinovsky y el giro copernicano de la estética peruana
No full textConstantino Malinovsky y Harlamoff, ingeniero, arqueólogo y esteta peruano, fue un inmigrante de la Rusia Blanca nacionalizado peruano que realizó importantes contribuciones al estudio, la divulgación y la interpretación del arte precolombino en el Perú. Lo que se transparenta a lo largo de la lectura de sus obras es una mirada honesta, justa y sincera del arte peruano precolombino —que nosotros denominaremos el giro copernicano en la estética peruana—, ajeno a todo esencialismo y artificialismo propio de los arqueólogos y estudiosos del arte contemporáneos a Malinovsky. Nuestro trabajo procederá en tres secciones: 1) Definir —contrario a Kant y demás autores— lo que llamaremos como giro copernicano trazado more geometrico y distinguirlo del giro trascendental o malogrado, trazado more ethico. 2) Revisar las adversas circunstancias en las cuales Malinovsky consigue su naturalización como peruano, a la par que desarrolla su teoría “cromática” respecto del arte peruano precolombino según campos visuales no antes explorados arqueológicamente y manejando la luz de una forma particular en sus análisis. Argumentaremos por qué la propuesta de Malinovsky es más bien una de corte estética filosófica more geometrico que las contemporáneas desde la antropología, arqueología e historia more ethico. 3) Finalmente, aplicaremos el nuevo concepto de giro copernicano a la propuesta estética de Malinovsky y brindaremos las conclusiones relativas a por qué su obra conjunta es un giro copernicano en la estética peruana
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
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