1,720,960 research outputs found
A comparison of tests of equality of covariance matrices : with special reference to the case of cluster sampling
No full textIn this thesis we compare tests of the equality of two covariance matrices. The distribution of likelihood ratio test for elliptical distributions is obtained. The One and Two moments adjustments to the test are proposed. The size, power and asymptotic convergence of normal-theory, asymptotically robust and elliptical-theory tests are examined for samples from normal, hypothetical non-normal and natural populations. Our proposed elliptical-theory tests perform very well with large samples from elliptical distributions. For moderate size of bivariate non-normal samples the standard error test is recommended. Estimators of asymptotic covariance matrices of vectors of second-order sample moments under cluster sampling from finite populations consisting of separate clusters are obtained using the delta method. When finite populations cut across the clusters an estimator of the covariance matrix of the difference between vectors of second-order moments from first and second cluster samples is also obtained. The standard error test for both types of finite populations is based on the respective estimators. The further empirical study only for asymptotically robust tests is based on cluster samples from normal and non-normal distributions with different levels of intracluster correlation, number of primary and secondary units. Independent and dependent cluster samples from natural populations are drawn. The effects of sampling design are examined. Applicability of transformations of second-order sample moments is established. Again the standard error test is found reasonable for moderate size of non-normal samples. Asymptotically robust tests for stratified cluster sampling are also described. (D72488/87)</p
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
An Empirical Investigation Between Trade Liberalization And Corruption: A Panel Data Approach
Full text linkThe present study empirically investigates the relationship between trade liberalization and corruption, using data from twenty four countries divided into three panels: low income, middle income and high income countries for a 13 years period, from 1995-2007. That period is taken to see this effect after the establishment of WTO. Many other economic and non economic variables have also been incorporated in this study. Fixed effect model have been used for estimation. The results show that trade liberalization is both statistically significant and negatively correlated to the corruption level of these countries included in the study. The results are robust even after controlling for other variables like economic freedom, democracy, size of bureaucracy, average income level and level of education. The focus of study is mainly on South Asian nations. Because according to the recent survey published by Transparency International related to Corruption, these nations are at the bottom of ranking ladder. Keywords: Corruption, Trade liberalization, Economic Freedom, Bureaucracy, Education
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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