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71.
Interval estimators for the population mean for skewed distributions with a small sample size 总被引:1,自引:0,他引:1
Glen Meeden 《Journal of applied statistics》1999,26(1):81-96
In finite population sampling, it has long been known that, for small sample sizes, when sampling from a skewed population, the usual frequentist intervals for the population mean cover the true value less often than their stated frequency of coverage. Recently, a non-informative Bayesian approach to some problems in finite population sampling has been developed, which is based on the 'Polya posterior'. For large sample sizes, these methods often closely mimic standard frequentist methods. In this paper, a modification of the 'Polya posterior', which employs the weighted Polya distribution, is shown to give interval estimators with improved coverage properties for problems with skewed populations and small sample sizes. This approach also yields improved tests for hypotheses about the mean of a skewed distribution. 相似文献
72.
Darold T. Barnum John M. Gleason Matthew G. Karlaftis Glen T. Schumock Karen L. Shields Sonali Tandon 《Journal of applied statistics》2012,39(4):815-828
This paper describes a statistical method for estimating data envelopment analysis (DEA) score confidence intervals for individual organizations or other entities. This method applies statistical panel data analysis, which provides proven and powerful methodologies for diagnostic testing and for estimation of confidence intervals. DEA scores are tested for violations of the standard statistical assumptions including contemporaneous correlation, serial correlation, heteroskedasticity and the absence of a normal distribution. Generalized least squares statistical models are used to adjust for violations that are present and to estimate valid confidence intervals within which the true efficiency of each individual decision-making unit occurs. This method is illustrated with two sets of panel data, one from large US urban transit systems and the other from a group of US hospital pharmacies. 相似文献
73.
74.
Phase II trials in oncology drug development are usually conducted to perform the initial assessment of treatment activity. The common designs in this setting, for example, Simon 2-stage designs, are often developed based on testing whether a parameter of interest, usually a proportion (e.g. response rate), is less than a certain level or not. These designs usually consider only one parameter. However, sometimes we may encounter situations where we need to consider not a single parameter, but multiple parameters. This paper presents a two-stage design in which both primary and secondary endpoints are utilized in the decision rules. The family-wise Type 1 error rate and statistical power of the proposed design are investigated under a variety of situations by means of Monte-Carlo simulations. 相似文献
75.
76.
We develop fast mean field variational methodology for Bayesian heteroscedastic semiparametric regression, in which both the mean and variance are smooth, but otherwise arbitrary, functions of the predictors. Our resulting algorithms are purely algebraic, devoid of numerical integration and Monte Carlo sampling. The locality property of mean field variational Bayes implies that the methodology also applies to larger models possessing variance function components. Simulation studies indicate good to excellent accuracy, and considerable time savings compared with Markov chain Monte Carlo. We also provide some illustrations from applications. 相似文献
77.
The radical shift by news audiences away from newspaper to motion media (video stories on TV, web, cell phones, handhelds) prompted the assessment of media modality (text, text + picture, video) and source (public relations, news, user-generated content [UGC]) effects on credibility and more importantly perceived veridicality, a perception of an object as being accurate and believable regardless of the source, as well as impact of messages. The findings revealed that motion media modality significantly enhances believability judgments and perceived veridicality, which is independent of source cue, in which news source garnered no greater credibility than PR or UGC source. 相似文献
78.
Ronald L. Simons Wei Chao Rand D. Conger Glen H. Elder 《Journal of marriage and the family》2001,63(1):63-79
Social scientists agree that childhood antisocial behavior portends adolescent delinquency, but there is little agreement regarding the theoretical processes that account for this behavioral continuity. Latent growth curve modeling was used to test latent trait and social influence explanations for this association. The analyses used data collected annually over a 4‐year period from a sample of 149 boys, 157 girls, and their parents. Contrary to latent trait theories, we found no direct association between oppositional/defiant behavior during childhood and a trajectory of increasing involvement with deviant peers and delinquency during adolescence. Rather, early oppositional/defiant behavior undermined effective parenting practices. The latter, in turn, predicted an increasing affiliation with deviant peers and delinquency during adolescence. Improvements in parenting during adolescence decreased delinquency indirectly by reducing affiliation with deviant peers. Overall, the results support a life course development model in which difficult behavior during childhood increases the probability of adolescent deviant behavior because of its disruptive effect on quality of parenting. 相似文献
79.
Abstract Parents shape children's social choices through their social and economic actions. Parental social participation connects children to a civic culture and encourages involvement in civic groups. Parents' ties to farming in farm‐dependent communities further enhance children's civic orientations by providing added opportunities and incentives for social participation. Data from the Iowa Youth and Families Project confirm these hypotheses, showing that the children of farmers and of rural leaders are more likely to participate in civic groups. These results establish parental social involvement as a source of social capital and demonstrate the importance of farm influences for understanding the social involvement of youth in rural society. 相似文献
80.
Glen Barnett Susan Crowe Malcolm Hudson Pui-Lam Leung Khairil Notodiputro Richard Proudfoot 《Journal of applied statistics》1989,16(2):223-242
We introduce a class of small scale simulation models—‘prototypes'—which reproduce many of the known properties of maximum likelihood and related reconstruction methods used in emission tomography, and greatly simplify the development of new methods. We introduce an iterative Fisher-scoring algorithm and demonstrate, by use of the prototype models, its superior speed of convergence when compared with the standard EM algorithm. 相似文献