1,720,957 research outputs found
Neyman smooth goodness-of-fit tests for the marginal distribution of dependent data
Get PDFNeyman’s smooth test, Goodness-of-fit, Strongly mixing process, Implied volatility,
Konfidenbänder für strukturelle Modelle
No full textDas Ziel dieser Arbeit ist die Konstruktion simultaner Konfidenzbänder für Strukturelle Modelle, die von Freitag (2000) und Freitag und Munk (2005) eingeführt wurden. Wir betrachten den zwei-Stichproben Fall. Dabei sind und zwei unabhängige Stichproben mit zugehörigen Verteilungsfunktionen beziehungsweise . Das strukturelle Modell (hier sind und zweimal differenzierbare reellwertige Funktionen) ist in der Lage verschiedene wichtige Zusammenhänge zwischen den Verteilungsfunktionen und darzustellen. Falls zum Beispiel und sind, bekommen wir das wichtige Lokationsmodell.Bei der Konstruktion der Konfidenzbänder schätzen wir zunächst den Parameter , dieser Schätzer wird in die P-P Plot Funktion eingesetzt. Für diese Funktion werden dann mit Hilfe der zwei-Stichproben plug-in empirical Likelihood Methode die Konfidenzbänder konstruiert.Die Arbeit verallgemeinert Hjort's {\sl et al} (2004) Ergebnisse, in der die ein Stichprobe plug-in empirical Likelihood Methode definiert wurde. Eine plug-in Version für empirical Likelihood erlaubt es uns punktweise Konfidenzbänder zu konstruieren. Um simultane Konfidenzbänder zu bekommen, benutzen wir die Methode von Hall und Owen (1993), bei der empirical Likelihood die Gestalt der Bänder bestimmt und die Bootstrap-Methode das Konfidenzniveau festlegt.Claesken's {\sl et al.} (2003) Ergebnisse, bei denen die Konfidenzbänder für gewöhnliche P-P plot Funktionen bezüglich zweier Verteilungsfunktionen und konstruiert wurden, folgt in unserem Arbeit aus dem Spezialfall . Dabei können die Konfidenzbänder für den P-P und Q-Q plot mit der gleichen Methode konstruiert werden. Dennoch beschränken wir uns auf die Konstruktion von P-P Plot Konfidenzbänder, da sie für strukturelle Modellen in einem gewissen Sinne vorteilhaft sind (siehe z.B. Holmgren im 1995). Darüberhinaus sind P-P Plots sehr interessant, da sie im engen Zusammenhang mit ROC-Kurven (Receiver Operating Characteristic) stehen, welche in der Medizin, Signaltheorie und Psychologie von Bedeutung sind (z.B. see Li, 1996).Speziel für Strukturelle Modelle haben wir eine glatte Version der empirical Likelihood bestimmt, welche die Methode der ein-Stichprobe empirical Likelihood von Chen and Hall (1993) benutzt. Für den Spezialfall des Lokationsmodell haben wir die asymptotischen Überdeckungsniveaus simuliert und Konfidenzbänder für reale Daten konstruiert.The goal of the thesis is to construct the simultaneous confidence bands for structural relationship models introduced by Freitag (2000), Freitag and Munk (2005). Consider the two-sample case, where and are independent samples with distribution functions and respectively. The structural relationship model , where and are some twice differentiable real-valued functions, describes several important relationships between the two distribution functions and . For example, if and we get the well-known location model.To construct the bands, we first estimate the unknown structural parameter and plug it in the P-P (probability-probability) plot function of structural relationship models. Further the simultaneous bands have been constructed using the two-sample plug-in empirical likelihood method, which has been established in the thesis.The thesis generalizes Hjort {\sl et al.} (2004) work, where the one-sample plug-in empirical likelihood has been defined. A plug-in version of empirical likelihood allows us to derive the pointwise confidence bands. %for the P-P plot of general structural relationship models. To obtain the simultaneous confidence bands we have used the method introduced by Hall and Owen (1993), where the empirical likelihood method sets the shape of the bands and bootstrap sets the level of the test.Claesken's {\sl et al.} (2003) results, where the confidence bands have been constructed for the usual P-P plot of two distribution functions and , follow from our results with functions . We show also that the P-P and Q-Q (quantile-quantile) plots for the independent samples can be treated in the same way. However, in the context of structural relationship models we found P-P plots advantageous above Q-Q plots. P-P plots have become even more interesting because they are closely related to Receiver Operating Characteristic (ROC) curves, which are important in signal theory, psychology, medicine, etc. (cf. Li {\sl et al.}, 1996).We complete our work with establishing a smoothed version of plug-in empirical likelihood for structural relationship models. To do this we have used the smoothed empirical likelihood method, which has been introduced by Chen and Hall (1993) for the one-sample case. For the location model we simulated the coverage levels and constructed the simultaneous bands for some real data problems
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
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
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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