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991.
992.
Bayesian Semiparametric Regression for Median Residual Life 总被引:3,自引:0,他引:3
Abstract. With survival data there is often interest not only in the survival time distribution but also in the residual survival time distribution. In fact, regression models to explain residual survival time might be desired. Building upon recent work of Kottas & Gelfand [ J. Amer. Statist. Assoc. 96 (2001) 1458], we formulate a semiparametric median residual life regression model induced by a semiparametric accelerated failure time regression model. We utilize a Bayesian approach which allows full and exact inference. Classical work essentially ignores covariates and is either based upon parametric assumptions or is limited to asymptotic inference in non-parametric settings. No regression modelling of median residual life appears to exist. The Bayesian modelling is developed through Dirichlet process mixing. The models are fitted using Gibbs sampling. Residual life inference is implemented extending the approach of Gelfand & Kottas [ J. Comput. Graph. Statist. 11 (2002) 289]. Finally, we present a fairly detailed analysis of a set of survival times with moderate censoring for patients with small cell lung cancer. 相似文献
993.
Bayesian hierarchical models are developed to estimate the frequencies of the alleles at the HLA-C locus in the presence of non-identifiable alleles and possible spatial correlations in a large but sparse, spatially defined database from Papua New Guinea. Bayesian model selection methods are applied to investigate the effects of altitude and language on the genetic diversity of HLA-C alleles. The general model includes fixed altitudinal effects, random language effects and random spatially structured location effects. Conditional autoregressive priors are used to incorporate the geographical structure of the map, and Markov chain Monte Carlo simulation methods are applied for estimation and inference. The results show that HLA-C allele frequencies are explained more by linguistic than altitudinal differences, indicating that genetic diversity at this locus in Papua New Guinea probably tracks population movements and is less influenced by natural selection than is variation at HLA-A and HLA-B. 相似文献
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995.
Stein-rule and other improved estimators have scarcely been used in empirical work. One major reason is that it is not easy to obtain precision measures for these estimators. In this paper, we derive unbiased estimators for both the mean squared error (MSE) and the scaled MSE matrices of a class of Stein-type estimators. Our derivation provides the basis for measuring the estimators' precision and constructing confidence bands. Comparisons are made between these MSE estimators and the least squares covariance estimator. For illustration, the methodology is applied to data on energy consumption. 相似文献
996.
Gail F. Melson Peter H. Kahn Jr. Alan Beck Batya Friedman 《The Journal of social issues》2009,65(3):545-567
Robotic "pets" are being marketed as social companions and are used in the emerging field of robot-assisted activities, including robot-assisted therapy (RAA). However, the limits to and potential of robotic analogues of living animals as social and therapeutic partners remain unclear. Do children and adults view robotic pets as "animal-like,""machine-like," or some combination of both? How do social behaviors differ toward a robotic versus living dog? To address these issues, we synthesized data from three studies of the robotic dog AIBO: (1) a content analysis of 6,438 Internet postings by 182 adult AIBO owners; (2) observations and interviews with 80 preschoolers during play periods with AIBO and with a stuffed dog; and (3) observations and interviews with 72 children, aged 7–15 years, who played with AIBO and a living dog. Overall, the studies revealed that "hybrid" cognitions and behaviors about AIBO emerged: the robotic dog was treated as a technological artifact that also embodied attributes of living animals, such as having mental states, being a social other, and having moral standing (although this latter finding remained difficult to interpret). Implications for use of robotic pets as companions and in interventions or therapy are explored. 相似文献
997.
Alan Aldridge 《The Sociological review》1995,43(3):415-434
Peter Mayle's best-selling accounts of his life in Provence have appealed to a wide audience in Britain but have also attracted harsh criticism. It is argued here that these works, although ostensibly about Provence, are better analysed as myths for the English. The contrast with an account from the 1930s reflects wider social change, showing a move from a confidently colonial to a self-consciously ‘anthropological’ mode. Doubts about the authenticity of Mayle's accounts are related both to his use of free indirect discourse and other literary devices in order to convey ethnographic colour, and to ideological tensions in post-colonial Britain. 相似文献
998.
Joint fundraising and promotional programs between businesses and nonprofits, often referred to as cause-related marketing, have been on the rise. During the 1980s, many large corporations initiated cause-related marketing programs. Less is known, however, about how widespread cause-related marketing has become among medium-size companies. In the study of 478 medium-size businesses reported here, one-fifth made contributions to nonprofits as part of cause-related marketing programs, and more were becoming interested, but many of the businesses were dissatisfied with the effect of their contributions to nonprofits. Satisfied business participants actively recommended nonprofits to other business owners and intended to increase their own contributions. The authors provide additional insights on business donor motivation through their application of the Seven Faces framework. 相似文献
999.
The nonparametric Bayesian approach for inference regarding the unknown distribution of a random sample customarily assumes that this distribution is random and arises through Dirichlet-process mixing. Previous work within this setting has focused on the mean of the posterior distribution of this random distribution, which is the predictive distribution of a future observation given the sample. Our interest here is in learning about other features of this posterior distribution as well as about posteriors associated with functionals of the distribution of the data. We indicate how to do this in the case of linear functionals. An illustration, with a sample from a Gamma distribution, utilizes Dirichlet-process mixtures of normals to recover this distribution and its features. 相似文献
1000.