1,721,080 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
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
Essays in International Trade and Innovation
Get PDFThis thesis contains three chapters that investigate issues in international trade and innovation. The first chapter examines government-backed technologies promoted in an international standard-setting organization (SSO) and their impacts on global innovation. Standardization ensures compatibility but can steer innovation by locking in specific technologies. Unlike other countries, the Chinese government coordinates its firms to advance specific domestic technologies in international SSOs. I study the impact of this policy on the direction of global innovation in 5G. In the SSO for 5G, firms compete to have their patented technologies adopted as part of the 5G standards. Using a large language model, I build a new database linking SSO technical documents, 5G policy documents published by the Chinese government, and 5G patents. I show that the policy promotes Chinese technologies in areas where China lags behind foreign competitors. If adopted as standards, these lagging technologies become the basis for subsequent 5G innovation across countries. These follow-on patents account for two-fifths of total 5G patents filed worldwide after standardization.
In the second chapter, I develop a trade model that incorporates cross-country differences in cost and risk profiles to analyze how risk-averse firms make optimal sourcing decisions considering both cost minimization and risk diversification. Firms are incentivized to minimize expected costs by sourcing from the lowest-cost suppliers, while also reducing profit variance by sourcing additionally from higher-cost alternatives. Calibrating the model to U.S. import data, I show that risk diversification explains 30% of the observed variation in U.S. import shares across countries for intermediate inputs.
The third chapter, based on joint work with John Lester, studies technology spillovers from firms performing research and development (R&D) in Canada and their implications for size-based R&D policies. Using panel data covering all firms performing R&D in Canada, we estimate the external return to R&D by size of firm, defining the spillover pool using a measure of technological proximity based on firms' reported expenditure in 147 research fields. We find that spillovers rise with the size of R&D performers, so Canada's policy of subsidizing R&D performed by small firms at a higher rate is not warranted.Ph.D
Essays in Internationsl Political Economy
No full textThis dissertation studies three important questions in international political economy:
The long run consequences of social divisions created by historical colonialism, the importance of trade shocks in shifting political power balances and shaping institutional development and the influence that major political powers have over the decisions
of smaller nations. I study these three questions empirically in four papers that
span three distinct regions and time periods. The first paper asks whether the large differences in economic development across Native American reservations today can
be explained by social divisions that were created more than 150 years ago when the
US government forcibly integrated distinct Native American bands into shared reservations, condemning them to a system of shared governance that was not consistent
with their political traditions and tribal identities. The second and third papers study
the effect of the first globalization on the political and economic equilibrium in seventeen 19th century British Caribbean plantation colonies. I use this set of highly comparable but in precise ways distinct islands as a laboratory to study the effect of globalization on the long run development of representative institutions and on the coerciveness of labour markets at the time. The first of two papers provides insights
into the working of colonial institutions and traces the mechanisms through which
the planter elite managed to maintain a monopoly over policy making and retard
long run development. The second paper highlights the importance that exogenous output price changes had for the willingness of planter elites to engage in costly coercion that distorted labour markets in their favour. In the final paper I test whether major aid donors use foreign aid to buy the votes of developing countries. Taking advantage of a unique long-running dispute between major donors in the International Whaling Commission, I am able to address the three major empirical challenges in answering this question: that aid moves much slower than voting behaviour, that alliances
constantly change with issues and that most international organizations vote frequently and on a range of issues while data on aid disbursals is available only in yearly aggregates.Ph
Essays on International Trade, Productivity, and Growth
Get PDFThis thesis investigates the role of institutions and firm behaviours in international trade.
Chapter 1 estimates a dynamic general equilibrium model of entry, exit, and endogenous productivity growth. Productivity is endogenous both at the industry level (firms enter and exit) and at the firm level (firms invest in productivity-enhancing activities). Three key findings emerge. First, there is no evidence of learning by exporting: the observed positive correlation between exporting and productivity operates entirely via the impact of exporting on productivity-enhancing investments. Restated, exporting decision raises productivity, but only indirectly by making investing in productivity more attractive. Second, there is evidence of learning by producing multiple products: product-mix raises productivity directly in addition to the investment channel. Third, there are strong complementarities among the product-mix, exporting and investment decisions. Finally, we simulate the effects of reductions in foreign tariffs. This increases exporting, investing, and wages. Productivity rises at the economy-wide level both because of the between firm reallocation effect and because of within firm increases in productivity.
Chapter 2 incorporates credit constraints into amodel of global sourcing and heterogeneous firms. Following Antras and Helpman(2004), heterogeneous firms decide whether to source inputs at arm’s length or within the boundary of the firm. Financing of fixed organizational costs requires borrowing with credit constraints and collateral based on tangible assets. The party that controls intermediate inputs is responsible for these financing costs. Sectors differ in their reliance on external finance and countries vary in their financial development. The model predicts that increased financial development increases the share of arm’s length transactions relative to integration in a country. The effect is most pronounced in sectors with a high reliance on external finance. Empirical examination of country-industry interaction effects confirms the predictions of the model.
Chapter 3 examines whether financial development facilitates economic growth by estimating the effect of financial development on reducing the costs of external finance to firms. The data reveal substantial evidence of decreasing returns to the benefit of financial development in industries that are more dependent on external finance and countries with less financial frictions.Ph
Three Essays in International Trade
Get PDFThis thesis comprises three chapters:
In Chapter I, I develop a general model to study the impact of labour mobility distortions on the gains from trade liberalization. The main feature of the model is that it combines comparative advantage forces with sectoral production misallocation. I use this framework to study the effect of labour market policies affecting the level of occupational mobility distortions on the gains from trade. I first show that differences in market structure across sectors lead to a misallocation of production. A planner is able to solve this misallocation by changing the composition of employment in the economy through changes in the level of labour market distortions. I use the model to study the impact of labour market distortions on the gains from trade from 1992 to 2007 in the US. I find that, relative to observed, optimal distortions lead to a 2.7% increase in the median cost of switching occupations and a doubling of welfare gains from trade.
In Chapter II, I examine whether trade liberalization decreases investment misallocation in India. I provide evidence that, independently of firm heterogeneity, exporters earn more revenue from the extensive margin of production. Also, I show that this difference between exporters and non-exporters is increasing in the degree of external financing needs of the sector in which firms operate. This finding suggests that an increase in trade liberalization has the additional effect of increasing the efficiency of the allocation of investment in new product varieties from less-productive non-exporters to more-productive exporters.
In Chapter III, I propose a model to explain deviations from the source-destination hierarchy prediction in models of trade with heterogeneous firms. I first show that firms do not follow a pecking order of foreign market entry. To explain these deviations, I show a two-period, partial equilibrium model with asymmetric information in product appeal. Firms know the appeal of their products but consumers are unaware of it. After consuming in the first period, consumers observe a noisy signal and update their expectations. Given the updating process, I show that there is an imperfect sorting of firms into markets.Ph.D
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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