1,720,957 research outputs found
Individual stock market risk and price valuation: the case of Titan S.A.
No full textPurposeThe purpose of this study is twofold: to test the hypothesis that the closing prices of Titan S.A. stock can be approximated by a random walk; and to valuate the risk associated to this stock. The first question is equivalent to the efficient market hypothesis (EMH) and, therefore, to the predictability of stock's closing price. The second question follows the first in a natural way, since stock's predictability and risk are in an inverse relationship.Design/methodology/approachThe paper investigates the existence of unit roots in the stock and in all stock index, in the lines of Dicky‐Fuller modeling. It then investigates the stock's risk focusing the interest in the behavior of the time series volatility under the hypothesis that they can be described by an autoregressive scheme. Finally, it looks at the relationship between stock returns and market returns in the lines of the market model.FindingsThe study concludes that although the predictability of the stock returns is impossible, the risk associated with the stock can to some extent be statistically rationalised.Originality/valueThe paper's value lies in looking into the probability that if the EMH is even approximately true, accepting above‐average risks is the only way to obtain better‐than‐average returns.</jats:sec
Comparison of Public, Private, Hybrid, and Community Cloud Computing in Terms of Purchasing and Supply Management: A Quantitative Approach
No full textCloud computing has become increasingly popular in recent years due to its cost-effectiveness, scalability, and flexibility. It offers four different deployment models, including public, private, hybrid, and community cloud computing. In this research paper, the aim is to compare these deployment models in terms of purchasing and supply management. A quantitative study is conducted to evaluate the benefits and challenges associated with each deployment model. Additionally, four different industries were analyzed in order to be understood how cloud computing can be leveraged for purchasing and supply management
Individual stock market risk and price valuation: the case of Titan S.A.
No full textPurpose – The purpose of this study is twofold: to test the hypothesis that the closing prices of Titan S.A. stock can be approximated by a random walk; and to valuate the risk associated to this stock. The first question is equivalent to the efficient market hypothesis (EMH) and, therefore, to the predictability of stock's closing price. The second question follows the first in a natural way, since stock's predictability and risk are in an inverse relationship. Design/methodology/approach – The paper investigates the existence of unit roots in the stock and in all stock index, in the lines of Dicky-Fuller modeling. It then investigates the stock's risk focusing the interest in the behavior of the time series volatility under the hypothesis that they can be described by an autoregressive scheme. Finally, it looks at the relationship between stock returns and market returns in the lines of the market model. Findings – The study concludes that although the predictability of the stock returns is impossible, the risk associated with the stock can to some extent be statistically rationalised. Originality/value – The paper's value lies in looking into the probability that if the EMH is even approximately true, accepting above-average risks is the only way to obtain better-than-average returns.Financial risk, Greece, Stock markets, Stock returns
Perceptions of Climate Change: How Social Dynamics Shape Environmental Decision-Making
Get PDFThis research paper examines how social dynamics shape environmental decision-making by analyzing qualitative data on public perceptions of climate change. Understanding these perceptions is crucial as they influence individual and collective actions toward climate adaptation and mitigation. The study synthesizes findings from various cultural contexts, highlighting the roles of gender relations, social capital, and cultural knowledge in shaping responses to climate change. The analysis reveals that social norms, trust, and community networks significantly impact environmental decisions. The paper underscores the importance of integrating social dynamics into climate policies to foster effective and inclusive environmental action
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
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