1,720,967 research outputs found
Gli effetti della modalità di comunicazione del rischio sulle scelte di investimento finanziario: i risultati di un esperimento
No full textLa modalità in cui sono presentate le scelte in condizioni di rischio
può influenzare la scelta di investimento finanziario? In questo
lavoro vengono riportati i risultati di un esperimento in cui i
partecipanti fronteggiano una serie di decisioni di investimento tra
un titolo con rendimento certo e uno con rendimento rischioso
presentate in diverse modalità “visive”: istogramma, albero e
verbale. I dati raccolti mostrano che le scelte di investimento variano
sulla base delle modalità di presentazione del titolo rischioso. In
particolare, i soggetti sono disposti a farsi carico di un maggiore
rischio quando il titolo rischioso è presentato con una modalità a loro
più familiare (preferita)
Voluntary Partnerships for Equally Sharing Contribution Costs
No full textWe investigate, both theoretically and experimentally, an institutional mechanism designed to enhance cooperation. In this mechanism, contributors have the option to voluntarily contribute to the public good and decide whether to join a (sub)group where partners equally share the contribution cost. Theoretically, stable cost-sharing partnerships enhance efficiency since their partners fully contribute, while outsiders would free-ride. Our data reveal that individual joining and contribution behaviors do not always align with benchmark predictions: partnerships are not always formed, and when they are, they are not always of the optimal size; partners often contribute less than maximally, and outsiders more than minimally. Nonetheless, we document systematic evidence of partnership formation and significantly improved provision of public goods across rounds
Testing isomorphic invariance across social dilemma games
Full text linkCan purely behavioral aspects affect voluntary cooperativeness in isomorphic social dilemma games? We experimentally test isomorphic invariance by comparing frames whose identical
payoffs are described as of the Prisoners’ Dilemma or the linear Public Good. Participants play two consecutive rounds of the same frame, with no between-round feedback information,
interacting with either the same or a different number of other subjects in each round. Hence, frames are compared between subjects whereas games with different numerosity are compared
both within subjects and between subjects. Our analysis rejects isomorphic invariance and shows significantly lower average cooperativeness in the linear Public Good frame across
all conditions. Moreover, we find a significantly negative effect of group size, especially in Prisoners’ Dilemma
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
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