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81.
JEAN‐FRANOIS COEURJOLLY DAVID DEREUDRE RÉMY DROUILHET FRÉDÉRIC LAVANCIER 《Scandinavian Journal of Statistics》2012,39(3):416-443
Abstract. This article studies a method to estimate the parameters governing the distribution of a stationary marked Gibbs point process. This procedure, known as the Takacs–Fiksel method, is based on the estimation of the left and right hand sides of the Georgii–Nguyen–Zessin formula and leads to a family of estimators due to the possible choices of test functions. We propose several examples illustrating the interest and flexibility of this procedure. We also provide sufficient conditions based on the model and the test functions to derive asymptotic properties (consistency and asymptotic normality) of the resulting estimator. The different assumptions are discussed for exponential family models and for a large class of test functions. A short simulation study is proposed to assess the correctness of the methodology and the asymptotic results. 相似文献
82.
W. DAVID BRADFORD ANDREW N. KLEIT PAUL J. NIETERT STEVEN ORNSTEIN 《Economic inquiry》2010,48(2):306-322
We examine how direct to consumer advertising affects the delay between diagnosis and pharmacological treatment for patients suffering from a common chronic disease. The primary data for this study consist of patients diagnosed with osteoarthritis (N = 18,235) taken from a geographically diverse national research network of 72 primary care practices with 348 physicians in 27 states over the 1999–2002 time period. Brand‐specific advertising data were collected for local and network television at the monthly level for the nearest media markets to the practices. Results of duration models of delay to treatment suggest advertising does affect the length of time that patients and physicians wait to initiate therapy. This evidence suggests that these effects may be welfare enhancing in that advertising tends to encourage more rapid adoption among patients who are good clinical candidates for the therapy and leads to less rapid adoption among some patients who are poor clinical candidates. (JEL D12, I11) 相似文献
83.
A great deal of scholarly attention has been devoted in recent years to the large-scale abandonment of newborn babies in the European past, with special emphasis given to the staggering rates of infant mortality among the foundlings. For the most part, scholars have agreed with the foundling home officials of the past in assigning much of the blame for this excess mortality to the women who took in the foundlings as wetnurses and subsequently as foster mothers. This article takes issue with this view, based on an examination of the children abandoned at the foundling home of Bologna, Italy in the nineteenth century. Four cohorts of foundlings are examined - those abandoned in 1809–30, 1829–30, 1849–50, and 1869–70 (N=3615) - as we trace the changing pattern of infant and early childhood mortality. Longitudinal methods are used in examining the life course of these foundlings and the determinants of their mortality. 相似文献
84.
85.
Head Start is a comprehensive, early childhood development program designed to augment the human capital and health capital levels of disadvantaged children. Evaluations of Head Start have tended to focus on cognitive outcomes; however, there is increasing recognition that other important outcomes can be influenced by participation. This article evaluates the long‐term impact of Head Start participation on smoking behavior in young adulthood by comparing the behavior of adults who attended Head Start with those of siblings who did not. We find that participation in Head Start reduces the probability that an individual smokes cigarettes as a young adult. (JEL I12, I28, I38) 相似文献
86.
Our reconceptualization of state transnationalism underlines the active role that states can play in generating and sustaining cross‐border flows between a nation's homeland and its diasporic communities. This represents a sort of ‘middle ground’ between formerly hegemonic state centric’ approaches to global processes (focusing heavily on the ‘international’) and more recent ones emphasizing ‘transnational’ dynamics (which primarily arise through the agency of cross‐border migrants). We discuss a typology of approaches and avoid the tendency to set nation‐states against global and transnational processes. In fact, we highlight the various ways in which states often initiate key transnational flows, such as migration and the integration of diasporic communities into the sending nation, as well as maintain and regulate various processes instigated by immigrants. As an iconic case, we present an illustrative study of the South Korean government and Korean diasporic communities in the USA. Finally, in a brief conclusion, we outline some challenges for future research. 相似文献
87.
We examine experimentally how and why voluntary contributions are affected by sequentiality. Instead of deciding simultaneously in each round, subjects are randomly ordered in a sequence which differs from round to round. We compare sessions in which subjects observe the contributions from earlier decisions in each round (“sequential treatment with information”) to sessions in which subjects decide sequentially within rounds, but cannot observe earlier contributions (“sequential treatment without information”). We also investigate whether average contributions are affected by the length of the sequence by varying group size. Our results show that sequentiality alone has no effect on contributions, but that the level of contributions increases when subjects are informed about the contributions of lower‐ranked subjects. We provide evidence that the so‐called “leadership effect” vanishes within rounds, and that group size has no significant impact on the average level of contributions in our sequential contribution games. (JEL C92, H41, D63) 相似文献
88.
ERIC LUIS UHLMANN DAVID A. PIZARRO PAUL BLOOM 《Journal for the theory of social behaviour》2008,38(3):293-322
Recent work within psychology demonstrates that unconscious cognition plays a central role in the judgments and actions of individuals. We distinguish between two basic types unconscious social cognition: unconsciousness of the influences on judgments and actions, and unconscious of the mental states (i.e., attitudes and feelings) that give rise to judgments and actions. Influence unconsciousness is corroborated by strong empirical evidence, but unconscious states are difficult to verify. We discuss procedures aimed at providing conclusive evidence of state unconsciousness, and apply them to recent empirical findings. 相似文献
89.
A traditional interpolation model is characterized by the choice of regularizer applied to the interpolant, and the choice of noise model. Typically, the regularizer has a single regularization constant , and the noise model has a single parameter . The ratio / alone is responsible for determining globally all these attributes of the interpolant: its complexity, flexibility, smoothness, characteristic scale length, and characteristic amplitude. We suggest that interpolation models should be able to capture more than just one flavour of simplicity and complexity. We describe Bayesian models in which the interpolant has a smoothness that varies spatially. We emphasize the importance, in practical implementation, of the concept of conditional convexity when designing models with many hyperparameters. We apply the new models to the interpolation of neuronal spike data and demonstrate a substantial improvement in generalization error. 相似文献
90.
Abstract. In this article, we estimate the parameters of a simple random network and a stochastic epidemic on that network using data consisting of recovery times of infected hosts. The SEIR epidemic model we fit has exponentially distributed transmission times with Gamma distributed exposed and infectious periods on a network where every edge exists with the same probability, independent of other edges. We employ a Bayesian framework and Markov chain Monte Carlo (MCMC) integration to make estimates of the joint posterior distribution of the model parameters. We discuss the accuracy of the parameter estimates under various prior assumptions and show that it is possible in many scientifically interesting cases to accurately recover the parameters. We demonstrate our approach by studying a measles outbreak in Hagelloch, Germany, in 1861 consisting of 188 affected individuals. We provide an R package to carry out these analyses, which is available publicly on the Comprehensive R Archive Network. 相似文献