Xem 1-20 trên 45 kết quả Random walks
  • Automatically identifying the polarity of words is a very important task in Natural Language Processing. It has applications in text classification, text filtering, analysis of product review, analysis of responses to surveys, and mining online discussions. We propose a method for identifying the polarity of words. We apply a Markov random walk model to a large word relatedness graph, producing a polarity estimate for any given word. A key advantage of the model is its ability to accurately and quickly assign a polarity sign and magnitude to any word. ...

    pdf9p hongdo_1 12-04-2013 17 1   Download

  • “Not more than half a dozen really good books about investing have been written in the past fifty years. This one may well be the classics category.” ----- FORBES This is a detailed abstract of the book. The opinions in the abstract only reflect those of the author’s not mine, though I largely agree with most of his opinions. The “I” in the abstract refers to the author. If you are only interested in how to make investment, you can read Part four directly. However, I strongly suggest you read the whole abstract....

    pdf35p vandoan27 10-06-2011 102 28   Download

  • A volume of collected works is almost always a bad sign for one's research trajectory, an indication of declining productivity as much as professional recognition. We hope to be the exception that proves this rule because neither of us is willing to concede that we have reached the apex of our careers . However, we do think that the papers collected in this volume form a coherent and exciting story, one that bears retelling now that we have the luxury of seeing the forest for the trees .

    pdf436p greengrass304 14-09-2012 38 18   Download

  • Let T (x, ε) denote the first hitting time of the disc of radius ε centered at x for Brownian motion on the two dimensional torus T2 . We prove that supx∈T2 T (x, ε)/| log ε|2 → 2/π as ε → 0. The same applies to Brownian motion on any smooth, compact connected, two-dimensional, Riemannian manifold with unit area and no boundary. As a consequence, we prove a conjecture, due to Aldous (1989), that the number of steps it takes a simple random walk to cover all points of the lattice torus Z2 is asymptotic to 4n2 (log...

    pdf33p tuanloccuoi 04-01-2013 18 5   Download

  • Chance events are commonplace in our daily lives. Every day we face situations where the result is uncertain, and, perhaps without realizing it, we guess about the likelihood of one outcome or another. Fortunately, mastering the concepts of probability can cast new light on situations where randomness and chance appear to rule. In this fully revised second edition of Understanding Probability, the reader can learn about the world of probability in an appealing way.

    pdf454p chipmoon 19-07-2012 36 4   Download

  • We establish three identities involving Dyck paths and alternating Motzkin paths, whose proofs are based on variants of the same bijection. We interpret these identities in terms of closed random walks on the halfline. We explain how these identities arise from combinatorial interpretations of certain properties of the -Hermite and -Laguerre ensembles of random matrix theory. We conclude by presenting two other identities obtained in the same way, for which finding combinatorial proofs is an open problem....

    pdf16p thulanh5 12-09-2011 30 3   Download

  • Opinion Question Answering (Opinion QA), which aims to find the authors’ sentimental opinions on a specific target, is more challenging than traditional factbased question answering problems. To extract the opinion oriented answers, we need to consider both topic relevance and opinion sentiment issues. Current solutions to this problem are mostly ad-hoc combinations of question topic information and opinion information.

    pdf9p hongphan_1 14-04-2013 19 3   Download

  • Tuyển tập các báo cáo nghiên cứu khoa học hay nhất của tạp chí toán học quốc tế đề tài: Random walks on generating sets for finite groups...

    pdf14p thulanh4 11-09-2011 17 2   Download

  • Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học tạp chí toán học quốc tế đề tài: Mixing time for a random walk on rooted trees...

    pdf13p thulanh8 19-09-2011 26 2   Download

  • Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học tạp chí Department of Mathematic dành cho các bạn yêu thích môn toán học đề tài: The Cover Time of Deterministic Random Walks...

    pdf30p thulanh7 04-10-2011 20 2   Download

  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học quốc tế cung cấp cho các bạn kiến thức về ngành y đề tài: Modeling the signaling endosome hypothesis: Why a drive to the nucleus is better than a (random) walk

    pdf15p toshiba17 31-10-2011 24 2   Download

  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Wertheim cung cấp cho các bạn kiến thức về ngành y đề tài: A non-random walk through the genome...

    pdf6p thulanh19 09-11-2011 19 2   Download

  • We consider the problem of answering complex questions that require inferencing and synthesizing information from multiple documents and can be seen as a kind of topicoriented, informative multi-document summarization. The stochastic, graph-based method for computing the relative importance of textual units (i.e. sentences) is very successful in generic summarization.

    pdf4p hongphan_1 15-04-2013 14 2   Download

  • Thị trường chứng khoán là canh bạc đối với những người không cần mất công hiểu biết về nó, nhưng thật ra nó là một trò chơi đầy trí tuệ và mất nhiều công sức. Nó có thể là con đường để nhà đầu tư đạt đỉnh vinh quang nhưng cũng có thể là nơi gieo mình xuống vực thẳm. Thành công trên con đường chinh phục thị trường chứng khoán Trong các lý thuyết về tài chính và kinh tế, có giả thuyết nổi tiếng "Random walk" (Bước di ngẫu nhiên).

    pdf5p maybay_thaboom 30-06-2010 213 105   Download

  • FOR many years the following question has been a source of continuing controversy in both academic and business circles: To what extent can the past history of a common stock's price be used to make meaningful predictions concerning the future price of the stock? Answers to this question have been provided on the one hand by the various chartist theories and on the other hand by the theory of random walks

    pdf79p conrepcon 13-04-2012 89 26   Download

  • FOR many years the following question has been a source of continuing controversy in both academic and business circles: To what extent can the past history of a common stock's price be used to make meaningful predictions concerning the future price of the stock? Answers to this question have been provided on the one hand by the various chartist theories and on the other hand by the theory of random walks

    pdf74p transang3 30-09-2012 26 8   Download

  • A desirable characteristic of a performance measure is that it be timely, i.e., measure the effect of the manager's actions on firm value at the time those actions are taken (Holmstrom, 1982). This suggests earnings should incorporate the future cash flow effects of managers' actions. Ifthis was all there were to the determination of earnings, we could understand the robust result from thirty years of evidence that, for shorter horizons, average annual earnings is relatively well-described by a random walk (see Watts and Zimmerman, 1986, chapter 6).

    pdf33p bin_pham 06-02-2013 46 8   Download

  • CHAPTER 18 Random Walk Behavior of CTA Returns. This chapter examines whether CTA percent changes in NAVs follow random walks with drift. Monthly data from January 1994 to December 2000 are tested for nonstationarity and random walk with drift, using the Augmented Dickey-Fuller test.

    pdf10p mama15 21-10-2010 48 7   Download

  • This is the ninth book of examples from Probability Theory. The topic Stochastic Processes is so big that I have chosen to split into two books. In the previous (eighth) book was treated examples of Random Walk and Markov chains, where the latter is dealt with in a fairly large chapter. In this book we give examples of Poisson processes, Birth and death processes, Queueing theory and other types of stochastic processes.

    pdf137p sn_buon 29-11-2012 33 7   Download

  • Our setup allows us to disentan- gle the implications of these two alternative pricing mechanisms that are standard in the open-economy macro literature. In our model, di®erent assumptions regarding the pricing decisions of ¯rms are virtually inconsequential for the properties of aggregate variables, other than the terms of trade. In particular, the real exchange rate and the international relative price of ¯nal tradable goods behave similarly across the two price setting regimes.

    pdf218p dangsuynghi 15-03-2013 18 7   Download

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