1,721,203 research outputs found
Esercizi di Statistica (corso progredito)
No full textQuesto volume raccoglie gran parte degli esercizi proposti come temi d'esame per l'insegnamento Statistica (corso progredito) -insegnamento obbligatorio dei corsi di laurea di secondo livello offerti dalla Facoltà di Scienze Statistiche di Padova- negli anni accademici dal 2004/2005 al 2009/2010. La natura degli esercizi presentati in queste pagine ne giustifica l'organizzazione secondo una semplice lista, e suggerisce al lettore che con essi si cimenta lo studio previo di tutti gli argomenti teorici a cui fanno riferimento. Si tratta di argomenti che riguardano gli elementi classici dell'Inferenza Statistica parametrica (problemi di stima puntuale, intervallare, di verifica d'ipotesi, teoria esatta e asintotica della funzione di verosimiglianza, procedure ottime e famiglie esponenziali), con l'aggiunta dei fondamenti dell'approccio Bayesiano all'inferenza e di primi elementi dell'inferenza basata su funzioni non distorte di stima e dell'inferenza robusta
Flexible Functional Modelling of Short-term effect of Ozone: Application to city of Milan, Italy.
No full textModelling short-term effects of ozone on morbidity: an application to the city of Milano, Italy, 1995-2003.
No full textIn this paper, we explore a range of concerns that arise in measuring
short-term effects of ozone on health. In particular, we tackle the problem of measuring
exposure using alternative daily measures of ozone derived from hourly concentrations.
We adopt the exposure paradigm of Chiogna and Bellini (Environmetrics
13:55–69, 2002) extending it to ozone concentrations, and we compare its performances
with respect to traditional exposure measures by exploiting model selection.
To investigate the stability of model selection, we then apply the idea of bootstrapping
the modelling process
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
Valutazione dei costi associati all'aumentata vulnerabilità dovuta al cambiamento climatico in Italia.
No full textVariations 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
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