3,997 research outputs found

    Is Las Vegas a Real City ?

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    Probabilistic abductive logic programming using Dirichlet priors

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    Probabilistic programming is an area of research that aims to develop general inference algorithms for probabilistic models expressed as probabilistic programs whose execution corresponds to inferring the parameters of those models. In this paper, we introduce a probabilistic programming language (PPL) based on abductive logic programming for performing inference in probabilistic models involving categorical distributions with Dirichlet priors. We encode these models as abductive logic programs enriched with probabilistic definitions and queries, and show how to execute and compile them to boolean formulas. Using the latter, we perform generalized inference using one of two proposed Markov Chain Monte Carlo (MCMC) sampling algorithms: an adaptation of uncollapsed Gibbs sampling from related work and a novel collapsed Gibbs sampling (CGS). We show that CGS converges faster than the uncollapsed version on a latent Dirichlet allocation (LDA) task using synthetic data. On similar data, we compare our PPL with LDA-specific algorithms and other PPLs. We find that all methods, except one, perform similarly and that the more expressive the PPL, the slower it is. We illustrate applications of our PPL on real data in two variants of LDA models (Seed and Cluster LDA), and in the repeated insertion model (RIM). In the latter, our PPL yields similar conclusions to inference with EM for Mallows models

    Gambling Alone? A Study of Solitary and Social Gambling in America

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    In his acclaimed 2000 book Bowling Alone, Robert Putnam documents a disturbing social trend of the broadest kind. Putnam cites a wide variety of data that indicate that over the past fifty years, Americans have become increasingly socially disengaged. In developing this theme, Putnam specifically cites the increase in casino gambling (and especially machine gambling) as evidence in support of his argument. Building on the empirical and theoretical work of Putnam, this exploratory article examines the subphenomenon of gambling alone by exploring sample survey data on solitary and social gambling behavior among adults who reside in Las Vegas, Nevada. Specifically, to further understand these phenomena, a number of demographic, attitudinal, and behavioral variables are examined for their explanatory power in predicting solitary vs. social gambling behavior

    A Survey of Selected Business Teachers and Business Students in Four Norfolk Public High Schools of Their Opinions of Various Aspects of the Phase Elective Program

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    It is hoped that in this study students\u27 and teachers\u27 opinions of the Phase Elective Program can be evaluated. The study examines the following questions: 1. Do teachers and students feel that the classroom instruction has improved in the nine-week phases? 2. Does the Phase Elective Program capitalize on teacher expertise? 3. Do teachers and students feel that the Phase Elective Program meets the students\u27 educational needs and interests better than the traditional program

    Changing Traditions: Examining the Factors That Determine the Probability of Bidding to Host the Olympic Games Over Time

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    In September 2017, the International Olympic Committee (IOC) announced that, for the first time in its history, it would award the hosting of two different Olympic Games at the same time, giving the 2024 and 2028 Summer Olympic Games to Paris and Los Angeles respectively. As a result, the question is raised as to why the IOC broke tradition in its host city selection process. The break of tradition is presumably due to a lack of candidates to host the 2028 Summer Olympics. With prior host cities reporting astronomical costs and high debt balances associated with hosting, many cities have retracted their bids or have refused to submit candidature bids altogether. The Olympics are one of the largest, most economically impactful mega-events in modern culture. While hosting does provide a nation with the opportunity to show off its infrastructure and culture before millions of people worldwide, the costs to host the event have steadily risen as the Olympics have become a larger and larger spectacle. This study uses a logistic regression model to determine the relative factors that determine a city\u27s willingness to bid and uses the results to draw conclusions as to why the willingness to host has fluctuated across time. The results show a definite change in the probabilities of a potential city bidding to host the Olympic Games across time and also provide insight into the factors that determine these changes in probabilities. By determining these conclusions, this study hopes to provide insight into ways that hosting the Olympics can become accessible to all prospective host cities so that there is increased competition in the host city selection process

    The Macroeconomics of Low Inflation

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    macroeconomics, low inflation

    A Small Unassuming Man Walked up to Me, Shook My Hand and Told Me, “I Really Enjoyed Your Paper”

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    Dr. David Dickens, Professor of Sociology at the University of Nevada Las Vegas, wrote this memoir at the invitation of Dmitri Shalin and gave his approval for posting the present version in the Erving Goffman Archives
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