1,720,988 research outputs found
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
Three Essays On Market Efficiency: Global Price Leadership, Informal Parallel Markets, And Market Microstructure
Get PDFThis dissertation tackles the concept of market efficiency from three distinct topics in applied economics, from microfinance, to agriculture commodity market, and further to market microstructure of the most advanced economy. The first essay, entitled "Market Efficiency and Price Discovery Among Leading Rice Exporting Countries", focuses on the issue of rice market efficiency. The study establishes, under Johansen's procedure, that there are long-run price co-movements existing among the three major rice-exporting countries, and within the United States domestic markets, the long-run efficient linkage between spot and future prices of rough rice, as Chicago Board of Trade rough rice futures converge to United States Department of Agriculture rough rice prices in a cash market. Regarding the efficiency among the export market prices, results show that the hypothesis of market efficiency are rejected in two of the three pairs, namely Thai-Vietnam and ThaiUS(Arkansas). The Gonzalo & Granger (1995) decomposition method finds that the Thai and United States rice are dominant in the price discovery process. Within the United States domestic markets, the dominant is the futures market followed by the cash market of the rough rice and then the milled rice export price. The second essay, entitled "Determinants for Formal Credit and Informal Credit Access: The Case of Thai Farm Households", examines determinants for Thai agricultural households' participation in formal and its informal parallel credit markets. The study follows Heckman's two-stage selection model (1979) approach to determine the informal loan participation of Thai agricultural households. Results reveal that households tend to 'stick' to the credit market in which they were previously engaged. This finding reinforces the vicious cycle which makes it more difficult for farmers to get out of debt. Secondly, the study finds that wealthier households are less likely to access credit, and are more likely to participate in formal credits than their less wealthy peers. Results also show less probability of credit access between May and December coinciding with the planting and harvesting season accentuating the nature of loans as working-capital rather than consumption loans. Finally, the study discovers that households with owned farmland are more likely to participate in the formal credit market, while households with rented farmland are more likely to participate in the informal credit market stressing the use of owned land as collateral to participate in the former. The final essay, entitled "On the Challenge of Testing Weak-Form Market Efficiency using High Frequency Data", explores the issue of efficiency in microstructure of the Exchange-Traded-Fund (ETF). This essay shows that the profitability of a simple technical trading strategy hinges heavily on the way the Trades And Quotes (TAQ) dataset is filtered for mistakes and outliers. This paper uses ultra-high-frequency TAQ data that cover the time-span since the inception of the S&P 500 ETF from January 1993 to December 2006. First, a widely used filtering methodology proposed by Hasbrouck (2003) is adopted. Under this methodology, the technical trading strategy clearly outperforms the buy-and-hold benchmark. However, when a more appropriate (stringent) filtering methodology is used, the technical trading strategy clearly underperforms the buy-and-hold benchmark. This evidence suggests that studies that based their methodology on Hasbrouck's (2003) less stringent filtering criterion could produce misleading results
The Nominal Share Price Puzzle
Get PDFThe average nominal prices of common stocks traded on the New York Stock Exchange have remained constant at approximately 40 per share since the Great Depression as a result of stock splits. It is surprising that U. S. firms actively maintained constant nominal prices for their shares while general prices in the economy went up more than tenfold. This is especially puzzling given that commissions paid by investors on trading ten 300 share. I review potential explanations including signaling and optimal trading ranges and find that none of the existing theories are able to explain the observed constant nominal prices. I suggest that the evidence is consistent with the idea that customs and norms can explain the nominal price puzzle
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
When No Law is Better than a Good Law
Get PDFThis paper argues, both theoretically and empirically, that sometimes no securities law may be better than a good securities law that is not enforced. The first part of the paper formalizes the sufficient conditions under which this happens for any law. The second part of the paper shows that a specific securities law - the law prohibiting insider trading - may satisfy these conditions. The third part of the paper takes this prediction to the data. We find that the cost of equity actually rises when some countries enact an insider trading law, but do not enforce it.insider trading, cost of capital, emerging markets, securities law, enforcement, International Development, G15, G18, K22, K42,
Conditional Skewness of Aggregate Market Returns
Get PDFThe skewness of the conditional return distribution plays a significant role in
financial theory and practice. This paper examines whether conditional skewness of
daily aggregate market returns is predictable and investigates the economic
mechanisms underlying this predictability. In both developed and emerging markets,
there is strong evidence that lagged returns predict skewness; returns are more
negatively skewed following an increase in stock prices and returns are more
positively skewed following a decrease in stock prices. The empirical evidence shows
that the traditional explanations such as the leverage effect, the volatility feedback
effect, the stock bubble model (Blanchard and Watson, 1982), and the fluctuating
uncertainty theory (Veronesi, 1999) are not driving the predictability of conditional
skewness at the market level. The relation between skewness and lagged returns is
more consistent with the Cao, Coval, and Hirshleifer (2002) model. Our findings
have implications for future theoretical and empirical models of time-varying market
return distributions, optimal asset allocation, and risk management
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