1,720,968 research outputs found
Replication data for: Nonparametric IV Methods for Dynamic Treatment Evaluation
No full textvan den Berg, Gerard J., Bonev, Petyo, and Mammen, Enno, (2020) “Nonparametric Instrumental Variable Methods for Dynamic Treatment Evaluation.” Review of Economics and Statistics 102:2, 355–367
Replication data for: Nonparametric IV Methods for Dynamic Treatment Evaluation
No full textvan den Berg, Gerard J., Bonev, Petyo, and Mammen, Enno, (2020) “Nonparametric Instrumental Variable Methods for Dynamic Treatment Evaluation.” Review of Economics and Statistics 102:2, 355–367
Replication data for: Nonparametric IV Methods for Dynamic Treatment Evaluation
No full textvan den Berg, Gerard J., Bonev, Petyo, and Mammen, Enno, (2020) “Nonparametric Instrumental Variable Methods for Dynamic Treatment Evaluation.” Review of Economics and Statistics 102:2, 355–367
Replication data for: Nonparametric IV Methods for Dynamic Treatment Evaluation
No full textvan den Berg, Gerard J., Bonev, Petyo, and Mammen, Enno, (2020) “Nonparametric Instrumental Variable Methods for Dynamic Treatment Evaluation.” Review of Economics and Statistics 102:2, 355–367
Essays in nonparametric instrumental variable regression
Full text linkIn my PhD thesis, I develop nonparametric instrumental variable methods for two different settings. First, in a duration setup, I develop an approach to deal with dynamic and static selection, two important problems in econometric research. The method can deal with censoring and is based on a comparison of cohorts. I also construct a framework to analyse the static endogeneity of a model. In addition to these identification results, I also provide the necessary estimation procedures and derive their asymptotic properties. Second, I show that a class of constrained penalised minimum distance estimators can be viewed as projections. In a simulation, I study their properties under monotonicity constraint. I construct a test for monotonicity and use it to analyse the effect of class size on test scores in a Minnesota dataset. The effect is revealed to be non-monotone. I suggest an economic approach to explain this result
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
Are older nuclear reactors less safe? Evidence from incident data in the French fleet
No full textThis paper studies the impact of age and reactor technology on safety in the French nuclear fleet between 1997 and 2015. We use a novel dataset encompassing over 19,000 nuclear safety events declared by plant managers to the French regulatory agency. A major problem for evaluating the effects of age and technology is that declarations of safety events are influenced by the plant managers’ level of transparency. We deal with this problem by restricting the analysis to the occurrences of particular types of events, such as automatic shut-downs. These events, due to their technical specifics, exhibit perfect detection and declaration rates. We obtain the following results. First, technology has a strong impact on reactor safety. Second, age has a significant and technology-specific effect on reactor safety. For instance, while in 1997 one additional year of age led to a 15% increase in the expected number of automatic shut-downs among the 900 MW reactors, this number was reduced to only 6% in 2014. In comparison, the 1450 MW reactors undergo a significantly larger number of automatic shut-downs, but age has a smaller effect on their rate of occurrence. Finally, we find that local transparency, defined as both detection abilities, reporting behaviours and declaration guidelines, plays a significant role in the explanation of the observed variations of declarations of events
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