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The AgentBased Perspective on Imitation
, 2002
"... Introduction This chapter presents the agentbased perspective on imitation. In this perspective, imitation is best considered as the behavior of an autonomous agent in relation to its environment, including other autonomous agents. We argue that such a perspective helps unfold the full potential o ..."
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Cited by 30 (7 self)
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Introduction This chapter presents the agentbased perspective on imitation. In this perspective, imitation is best considered as the behavior of an autonomous agent in relation to its environment, including other autonomous agents. We argue that such a perspective helps unfold the full potential of research on imitation and helps in identifying challenging and important research issues. We first explain the agentbased perspective and then discuss it in the context of particular research issues in studies with animals and artifacts, with reference to chapters presented in this book. At the end of the chapter we briefly introduce the individual contributions to this book and provide a roadmap that helps the reader in navigating through the exciting and highly interwoven themes that are presented in this book. In order to focus discussions, we explain the agentbased perspective with particular consideration of the correspondence
Recent developments in nonperturbative quantum gravity, in Quantum Gravity and Cosmology
 Proceedings of the XXIIth GIFT International Seminar on Theoretical Physics
, 1991
"... New results from the new variables/loop representation program of nonperturbative quantum gravity are presented, with a focus on results of Ashtekar, Rovelli and the author which greatly clarify the physical interpretation of the quantum states in the loop representation. These include: 1) The const ..."
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Cited by 25 (7 self)
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New results from the new variables/loop representation program of nonperturbative quantum gravity are presented, with a focus on results of Ashtekar, Rovelli and the author which greatly clarify the physical interpretation of the quantum states in the loop representation. These include: 1) The construction of a class of states which approximate smooth metrics for length measurements on scales, L, to order lPlanck/L. 2) The discovery that any such state must have discrete structure at the Planck length. 3) The construction of operators for the area of arbitrary surfaces and volumes of arbitrary regions and the discovery that these operators are finite. 4) The diagonalization of these operators and the demonstration that the spectra are discrete, so that in quantum gravity areas and volumes are quantized in Planck units. 5) The construction of finite diffeomorphism invariant operators that measure geometrical quantities such as the volume of the universe and the areas of minimal surfaces. These results are made possible by the use of new techniques for the regularization of operator products that respect diffeomorphism invariance. Several new results in the classical theory are also reviewed including the solution of the hamiltonian and diffeomorphism constraints in closed form of Capovilla, Dell and Jacobson and a new form of the action that induces ChernSimon theory on the boundaries of spacetime. A new classical discretization of the Einstein equations is also presented. 1 bitnet address:
Competing theories of financial anomalies
 Review of Financial Studies
, 2002
"... We present a comparative analysis of two sets of competing theories of financial anomalies: (1) “behavioral ” theories relying on investor irrationality; and (2) rational “structural uncertainty” theories where investors have incomplete information about the economic environment. Each set of theorie ..."
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Cited by 25 (1 self)
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We present a comparative analysis of two sets of competing theories of financial anomalies: (1) “behavioral ” theories relying on investor irrationality; and (2) rational “structural uncertainty” theories where investors have incomplete information about the economic environment. Each set of theories deviates from the rational expectations ideal, relaxing one, but not the other, of its two major assumptions. Despite their differing theoretical foundations, the two sets of theories share remarkable mathematical and predictive similarities and differ mainly in the labels they attach to similar modeling techniques and in the interpretations they give to resulting predictions. Their similarity leaves the theories virtually indistinguishable empirically, even as their normative implications differ significantly. This similarity, however, may point to deeper and overlooked connections between investor irrationality and rational structural uncertainty. We illustrate our ideas by examining competing theories of IPO underperformance.
Toward a systematic framework for research on dominant designs, technological innovations, and industrial change
, 2006
"... ..."
Simple forecasts and paradigm shifts
 Journal of Finance
, 2007
"... Abstract: We study the implications of learning in an environment where the true model of the world is a multivariate one, but where agents update only over the class of simple univariate models. If a particular simple model does a poor job of forecasting over a period of time, it is eventually disc ..."
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Cited by 14 (0 self)
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Abstract: We study the implications of learning in an environment where the true model of the world is a multivariate one, but where agents update only over the class of simple univariate models. If a particular simple model does a poor job of forecasting over a period of time, it is eventually discarded in favor of an alternative—yet equally simple—model that would have done better over the same period. This theory makes several distinctive predictions, which, for concreteness, we develop in a stockmarket setting. For example, starting with symmetric and homoskedastic fundamentals, the theory yields forecastable variation in the size of the value/glamour differential, in volatility, and in the skewness of returns. Some of these features mirror familiar accounts of stockprice bubbles.
Making a Case for MultiAgent Systems
 Proceedings of MAAMAW '97
, 1997
"... MultiAgent Systems (MAS) promise to offer solutions to problems where established, older paradigms fall short. To be able to keep promises, however, indepth studies of advantages and weaknesses of MAS solutions versus conventional ones in practical applications are needed. In this paper we offe ..."
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Cited by 12 (7 self)
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MultiAgent Systems (MAS) promise to offer solutions to problems where established, older paradigms fall short. To be able to keep promises, however, indepth studies of advantages and weaknesses of MAS solutions versus conventional ones in practical applications are needed. In this paper we offer one such study. Climate control in large buildings is one application area where MAS, and marketoriented programming in particular, have been reported to be very successful. We have therefore constructed and implemented a variety of market designs for this problem, as well as different standard control engineering solutions. This paper gives a detailed analysis and comparison, so as to learn about differences between standard versus MAS approaches, and yielding new insights about benefits and limitations of computational markets. 1 Introduction When new paradigms arise on the scientific horizon, they must prove their value in comparison and competition with existing, more establi...
Social Exclusion and Ethnic Groups: The Challenge to Economics
"... This article discusses the concept of social exclusion with an eye to assessing its utility in the study of ethnic and racial group inequality in the modern nation state. A brief review of the literature and some methodological discussion are offered. The article then examines racebased social excl ..."
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Cited by 9 (0 self)
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This article discusses the concept of social exclusion with an eye to assessing its utility in the study of ethnic and racial group inequality in the modern nation state. A brief review of the literature and some methodological discussion are offered. The article then examines racebased social exclusion in the United States, showing bow race and ethnicity can inhibit the full participation of individuals in a society’s economic life. The concept of social capitalthe role of nonmarket relations in aiding or impeding investments in human skillsis stressed. The article concludes with a discussion of the legitimacy of racebased remedies for the problem of exclusion. The concept of social exclusion has gained wide currency in recent years. But is this concept useful in studying racial and ethnic inequality? Social divisions between racial and ethnic groupsalong economic, cultural, and political linesare a central feature of public life throughout the world. The problem spans geographic and political boundaries and reflects universal social dynamics. Accordingly, much can be learned from comparing such tensions across national boundaries. Inequality and conflict between groups entail not just economic but also,
A methodology to define physical constants using mathematical constants” July/August 2011
 Issue 4, pgs 3943, DOI 10.1109/POT.2011.940377
"... It is stated that mathematical constants are not the same as physical constants, although both utilize the same mathematical structures. Euclidean geometry is based upon a defined set of rules, estabIEEE lished by logic, which give predictable results when followed. The mathematical process describ ..."
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Cited by 2 (2 self)
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It is stated that mathematical constants are not the same as physical constants, although both utilize the same mathematical structures. Euclidean geometry is based upon a defined set of rules, estabIEEE lished by logic, which give predictable results when followed. The mathematical process described in this paper, following the rules of Euclidean geometry, allow physical constants to be defined using mathematical constants. The process uses a pair of right triangles to define two basic units of measures, a unit of length and a unit of time. The numeric values that define the dimensions of the two right triangles are universally considered to be mathematical constants. The geometric process exploits the known physical law relationship between wavelength and frequency, this without needing to know any contemporary units of measure. A primary product of the triangle pair is a mathematically defined value for the velocity of light using mathematical constants. The geometric process readily allows a set of fundamental units, and related derivations, to be compared to contemporary SI units. 1.