1,721,200 research outputs found
OMG: GW, CLT, CRT and CFTP (Flajolet Award Lecture)
No full textAfter a brief review of the main results on Galton-Watson trees from the past two decades, we will discuss a few recent results in the field
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
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
The Double Kernel Method In Density Estimation
Get PDFLet f nh be the Parzen-Rosenblatt kernel estimate of a density f on the real line, based upon a sample of n i.i.d. random variables drawn from f , and with smoothing factor h. Let g nh be another kernel estimate based upon the same data, but with a di#erent kernel. We choose the smoothing factor H so as to minimize and study the properties of f nH and g nH . It is shown that the estimates are consistent for all densities provided that the characteristic functions of the two kernels do not coincide in an open neighborhood of the origin. Also, for some pairs of kernels, and all densities in the saturation class of the first kernel, we show that |) C, where C is a constant depending upon the pair of kernels only. This constant can be arbitrarily close to one. Keywords and phrases. Density estimation. Asymptotic optimality. Nonparametric estimation. Strong convergence. Kernel estimate. Automatic choice of the smoothing factor. 1991 Mathematics Subject Classifications: 62G05, 62H99, 62G20. Author's address: School of Computer Science, McGill University, 3480 University Street, Montreal, Canada H3A 2K6. The author's research was sponsored by NSERC Grant A3456 and FCAR Grant 90-ER-0291. FAX number: 1--514--398-3883. TABLE OF CONTENTS 1
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
Almost Sure Testability Of Classes Of Densities
No full text. Let a class F of densities be given. We draw an i.i.d. sample from a density f which may or may not be in F . After every n, one must make a guess whether f 2 F or not. A class is almost surely testable if there exists such a testing sequence such that for any f , we make finitely many errors almost surely. In this paper, several results are given that allow one to decide whether a class is almost surely testable. For example, continuity and square integrability are not testable, but unimodality, log-concavity, and boundedness by a given constant are. Keywords and phrases. Density estimation, kernel estimate, convergence, testing, asymptotic optimality, minimax rate, minimum distance estimation, total boundedness. 1991 Mathematics Subject Classifications: Primary 62G05. Running Head: testing densities The first author's work was supported by NSERC Grant A3456 and by FCAR Grant 90-ER-0291. The second authors' work was supported by DIGES Grant PB96-0300. Table of Contents 1. Intro..
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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