1,751,267 research outputs found
Christopher A. Hart
No full textChristopher A. Hart is a Member of the National Transportation Safety Board. In March, 2015, he was nominated by President Obama and confirmed by the Senate to be Chairman, which he was until March, 2017. Prior to that he was Vice Chairman of the NTSB, after being nominated by President Obama and confirmed by the Senate in 2009 and 2013. The NTSB investigates major transportation accidents in all modes of transportation, determines probable cause, and makes recommendations in an effort to prevent recurrences. He was previously a Member of the NTSB in 1990, having been nominated by (the first) President Bush.
Mr. Hart’s previous positions have included: Deputy Director, Air Traffic Safety Oversight Service, Federal Aviation Administration Assistant Administrator for System Safety, Federal Aviation Administration Deputy Administrator for the National Highway Traffic Safety Administration (NHTSA) Deputy Assistant General Counsel to the Department of Transportation Managing partner of Hart & Chavers, a Washington, D.C. law firm Attorney with the Air Transport Association
Mr. Hart has a law degree from Harvard Law School and a Master’s Degree (magna cum laude) in Aerospace Engineering from Princeton University. He is a member of the District of Columbia Bar and the Lawyer-Pilots Bar Association, and he is a pilot with commercial, multi-engine, and instrument ratings.https://commons.erau.edu/ntas-bios/1001/thumbnail.jp
Christopher A. Sims and Vector Autoregressions
Get PDFAbstract Three decades ago, Christopher A. Sims suggested that vector autoregressions (VARs) are useful statistical devices for evaluating alternative macroeconomic models. His suggestion has stood the test of time well. In the early days, VARs played an important role in the evaluation of alternative models. They continue to play that role today
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
Equilibrium in the Labour Market with Search Frictions
Get PDFChristopher A. Pissarides delivered his Prize Lecture on 8 December 2010 at Aula Magna, Stockholm University.Search frictions;
Interview with the 2011 Laureates in Economic Sciences Thomas J. Sargent and Christopher A. Sims
No full textInterview with the 2011 Laureates in Economic Sciences Thomas J. Sargent and Christopher A. Sims, 6 December 2011. The interviewer is Adam Smith, Editorial Director of Nobel Media.Causation; macroeconomics
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
Interview with Nobel Prize Laureates Peter A. Diamond, Dale T. Mortensen and Christopher A. Pissarides
No full textInterview with the 2010 Laureates in Economic Sciences Peter A. Diamond, Dale T. Mortensen and Christopher A. Pissarides, 6 December 2010. The interviewer is Adam Smith, Editorial Director of Nobel Media.Search frictions;
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
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