1,720,999 research outputs found
Datasets for "An Evaluation of Bayesian Approaches based on Uniformly Most Powerful Tests for Detecting Violations of Local Independence"
No full textThese files contain the results of the simulation studies reported in the main text. A detailed documentation is included as pdf file
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
Methods of dimensionality assessment in psychological measurement and their application to cognitive assessment
No full textDie vorliegende Arbeit beschreibt und beurteilt verschiedene Methoden zur Erfassung der Anzahl zugrundeliegender Dimensionen in der Bewertung und Entwicklung psychologischer Testverfahren. Sie umfasst drei Studien, von denen die ersten beiden exploratorische Verfahren zur Beurteilung der Dimensionalität einer Aufgabengruppe untersuchen. Die erste Studie untersuchte einen Algorithmus zur Gruppierung von Aufgaben im Kontext des Rasch-Modells. Das Ziel des untersuchten Algorithmus besteht im Finden von Aufgabengruppen, die eine gute Passung auf das Rasch-Modell zeigen, und dem Ausschließen von Aufgaben, welche Modellverletzungen zeigen. Dieser Ansatz wurde mit Hilfe einer Simulationsstudie untersucht, welche die Resultate dieses Algorithmus mit denen einer Hauptkomponentenanalyse tetrachorischer Korrelationen verglich. Es zeigte sich, dass der untersuchte Algorithmus zu praktisch verwertbaren Ergebnissen führt, insbesondere wenn Daten von großen Personenstichproben untersucht werden. Die zweite Studie untersuchte die Hauptkomponentenanalyse geglätteter tetrachorischer Korrelationsmatrizen als Maß für die Dimensionalität, wieder durch Anwendung einer Simulationsstudie. Indem die Ergebnisse verschiedener Glättungsalgorithmen verglichen wurden, zeigte sich, dass die Anwendung von Glättungsalgorithmen unter zahlreichen Bedingungen zu verbesserten Ergebnissen in der Messung der Dimensionalität führte. Die dritte Studie veranschaulichte einen konfirmatorischen Ansatz zur Modellierung von Antworten und Antwortzeiten durch dessen Anwendung auf zwei Aufgabentypen zur Erfassung mentaler Rotation. Diese Studie prüfte die Hypothese, dass die allgemein bekannten Geschlechtsunterschiede in der Fähigkeit zur mentalen Rotation durch Geschlechtsunterschiede in der Verarbeitungsgeschwindigkeit mentaler Rotationsaufgaben verursacht werden. Nachdem Fähigkeit und Verarbeitungsgeschwindigkeit modelliert wurden, zeigte sich, dass bei beiden Aufgabentypen nur Unterschiede in der Fähigkeit zur mentalen Rotation gefunden werden konnten, nicht jedoch in der entsprechenden
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Verarbeitungsgeschwindigkeit. Zudem wurde eine negative Korrelation zwischen Verarbeitungsgeschwindigkeit und Fähigkeit gefunden, was mit den Ergebnissen, welche für andere Fähigkeitstests gefunden wurde, übereinstimmt.This doctoral thesis describes and evaluates different methods of dimensionality assessment in psychological test evaluation and development. It consists of three studies, of which the first two investigate exploratory procedures to determine the dimensionality of an item set. The first study examined an approach for clustering items in Rasch measurement. The purpose of the examined algorithm is to find item clusters which show a good fit to the Rasch model while excluding items which show model violations. This approach was evaluated by the means of a simulation study, which compared the results of this algorithm with the results obtained from the application of a principal component analysis of tetrachoric correlations. It was found that the examined algorithm leads to practically usable results, especially for the analysis of data from large person samples. The second study investigated the principal component analysis of smoothed tetrachoric correlation matrices as a measure of dimensionality, again by the means of a simulation study. By comparing the results of several smoothing algorithms, it was found that the application of smoothing algorithms to the principal component analysis of tetrachoric correlations led to improved results in the assessment of dimensionality under multiple conditions. The third study exemplified a confirmatory approach for modeling responses and response times by applying it to two types of mental rotation tasks. This study investigated the hypothesis that the well-known gender differences in mental rotation ability are caused by gender differences in mental rotation speed. After modeling both speed and ability, it was found for both task types that gender differences could only be observed for mental rotation ability, but not for mental rotation processing speed. Furthermore, a negative correlation between speed and ability could be observed in both mental rotation tasks, which was in line with results obtained for other ability tests
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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