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作者：Billard, L; Diday, E
作者单位：University System of Georgia; University of Georgia; Universite PSL; Universite Paris-Dauphine
摘要：Increasingly, datasets are so large they must be summarized in some fashion so that the resulting summary dataset is of a more manageable size, while still retaining as much knowledge inherent to the entire dataset as possible. One consequence of this situation is that the data may no longer be formatted as single values such as is the case for classical data, but rather may be represented by lists, intervals, distributions, and the like. These summarized data are examples of symbolic data. Th...
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作者：Ling, SQ
作者单位：Hong Kong University of Science & Technology
摘要：This article considers the fractionally autoregressive integrated moving average [ARFIMA(p, d, q)] models with GARCH errors. The process generated by this model is short memory, long memory, stationary, and nonstationary, respectively, when d is an element of (- 1/2, 0), d is an element of (0, 1/2), d is an element of (- 1/2, 1/2), and d is an element of (1/2, infinity). Using a unified approach, the local asymptotic normality of the model is established for d is an element of U-j=0(infinity)(...
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作者：Boatwright, P; Borle, S; Kadane, JB
作者单位：Carnegie Mellon University; Rice University
摘要：Prediction of purchase timing and quantity decisions of a household is an important element for success of any retailer. This is especially so for an online retailer, as the traditional brick and-mortar retailer would be more concerned with total sales. A number of statistical models have been developed in the marketing literature to aid traditional retailers in predicting sales and analyzing the impact of various marketing activities on sales. However, there are two important differences betw...
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作者：Hu, FF; Rosenberger, WF
作者单位：University of Virginia; National University of Singapore; University System of Maryland; University of Maryland Baltimore County; University System of Maryland; University of Maryland Baltimore; National University of Singapore
摘要：We provide a theoretical template for the comparison of response-adaptive randomization procedures for clinical trials. Using a Taylor expansion of the noncentrality parameter of the usual chi-squared test for binary responses, we show explicitly the relationship among the target allocation proportion, the bias of the randomization procedure from that target, and the variability induced by the randomization procedure. We also generalize this relationship for more than two treatments under vari...
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作者：Puig, P
作者单位：Autonomous University of Barcelona
摘要：This article reports on two-parameter count distributions (satisfying very general conditions) that are closed under addition so that their maximum likelihood estimator (MLE) of the population mean is the sample mean. The most important of these in practice, the generalized Hermite distribution, is analyzed, and a necessary and sufficient condition is given to ensure that the MLE is the solution of likelihood equations. Score test to contrast the Poisson assumption is studied, and two examples...
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作者：Straf, ML
作者单位：National Academies of Sciences, Engineering & Medicine
摘要：New technologies benefit our lives in many ways, but they can also bring increased risks, disruptions to our society, and even the malevolence of war. Statisticians can play a critical role in influencing the paths along which technology will take our society. But taking on this role requires changing our discipline, our profession, and our ASA. Change, however, is not an option; if we do not change, then technology may force change on us in detrimental ways. Understanding how to change requir...
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作者：He, XM; Zhu, LX
作者单位：University of Illinois System; University of Illinois Urbana-Champaign; University of Hong Kong; Chinese Academy of Sciences; Academy of Mathematics & System Sciences, CAS
摘要：We propose an omnibus lack-of-fit test for linear or nonlinear quantile regression based on a cusum process of the gradient vector. The test does not involve nonparametric smoothing but is consistent for all nonparametric alternatives without any moment conditions on the regression error. In addition, the test is suitable for detecting the local alternatives of any order arbitrarily close to n(-1/2) from the null hypothesis. The limiting distribution of the proposed test statistic is non-Gauss...
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作者：Suchard, MA; Weiss, RE; Dorman, KS; Sinsheimer, JS
作者单位：University of California System; University of California Los Angeles; University of California Los Angeles Medical Center; David Geffen School of Medicine at UCLA; University of California System; University of California Los Angeles; Iowa State University; University of California System; University of California Los Angeles; University of California Los Angeles Medical Center; David Geffen School of Medicine at UCLA
摘要：We develop a Bayesian multiple changepoint model to infer spatial phylogenetic variation (SPV) along aligned molecular sequence data. SPV occurs in sequences from organisms that have undergone biological recombination or when evolutionary rates and selective pressures vary, along the sequences. This Bayesian approach permits estimation of uncertainty regarding recombination, the crossing-over locations, and all other model parameters. The model assumes that the sites along the data separate in...
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作者：Banerjee, S; Gelfand, AE; Sirmans, CF
作者单位：University of Minnesota System; University of Minnesota Twin Cities; Duke University; University of Connecticut
摘要：Spatial process models are now widely used for inference in many areas of application. In such contexts interest is often in the rate of change of a spatial surface at a given location in a given direction. Examples include temperature or rainfall gradients in meteorology, pollution gradients for environmental data, and surface roughness assessment for digital elevation models. Because the spatial surface is viewed as a random realization, all such rates of change are random as well. We formal...
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作者：Dunson, DB
作者单位：National Institutes of Health (NIH) - USA; NIH National Institute of Environmental Health Sciences (NIEHS)
摘要：This article presents a new approach for analysis of multidimensional longitudinal data, motivated by studies using an item response battery to measure traits of an individual repeatedly over time. A general modeling framework is proposed that allows mixtures of count, categorical, and continuous response variables. Each response is related to age-specific latent traits through a generalized linear model that accommodates item-specific measurement errors. A transition model allows the latent t...
