-
作者：Shaked, M; Suarez-Llorens, A
作者单位：University of Arizona; Universidad de Cadiz
摘要：In this article we study the comparison of experiments in system reliability theory when the component lifetimes are independent and identically distributed random variables that have a common two-parameter exponential distribution with a location parameter theta. For this purpose, we define a new stochastic order, which we call the convolution order, and study some basic properties of it. We then focus our attention on the family of distribution functions that are mixtures of distributions of...
-
作者：Wang, JY; Fuller, WA
作者单位：Merck & Company; Merck & Company USA; Iowa State University
摘要：In the small area estimation literature, the sampling error variances are customarily assumed to be known or to depend on a finite number of parameters. We consider the empirical best linear unbiased predictor (EBLUP) obtained by using the individual directly estimated variance for each small area. An approximation for the mean squared error (MSE) of the EBLUP that recognizes the impact on the predictors of estimation of the variance components is derived. Simulation studies show that the theo...
-
作者：Holmes, CC; Mallick, BK
作者单位：Imperial College London; Texas A&M University System; Texas A&M University College Station
摘要：A Bayesian method is presented for the nonparametric modeling of univariate and multivariate non-Gaussian response data. Data-adaptive multivariate regression splines are used where the number and location of the knot points are treated as random. The posterior model space is explored using a reversible-jump Markov chain Monte Carlo sampler. Computational difficulties are partly alleviated by introducing a random residual effect in the model that leaves many of the posterior conditional distri...
-
作者：Hall, P; Müller, HG
作者单位：Australian National University; University of California System; University of California Davis
摘要：In some regression problems we observe a response Y-ti to level t of a treatment applied to an individual with level Xi of a given characteristic, where it has been established that response is monotone increasing in the level of the treatment. A related problem arises when estimating conditional distributions, where the raw data are typically independent and identically distributed pairs (X-i, Z(i)), and Y-ti denotes the proportion of Z(i)'s.that do not exceed t. We expect the regression mean...
-
作者：Shen, XT; Tseng, GC; Zhang, XG; Wong, WH
作者单位：University System of Ohio; Ohio State University; University of Minnesota System; University of Minnesota Twin Cities; Pennsylvania Commonwealth System of Higher Education (PCSHE); University of Pittsburgh; Tsinghua University; Harvard University; Harvard T.H. Chan School of Public Health
摘要：The concept of large margins have been recognized as an important principle in analyzing learning methodologies, including boosting, neural networks, and support vector machines (SVMs). However, this concept alone is not adequate for learning in nonseparable cases. We propose a learning methodology, called psi-learning, that is derived from a direct consideration of generalization errors. We provide a theory for psi-learning and show that it essentially attains the optimal rates of convergence...
-
作者：Andersen, TG; Bollerslev, T; Diebold, FX; Labys, P
-
作者：Dodd, LE; Pepe, MS
作者单位：National Institutes of Health (NIH) - USA; NIH National Cancer Institute (NCI); University of Washington; University of Washington Seattle
摘要：Medical advances continue to provide new and potentially better means for detecting disease. Such is true in cancer, for example, where biomarkers are sought for early detection and where improvements in imaging methods may pick up the initial functional and molecular changes associated with cancer development. In other binary classification tasks, computational algorithms such as neural networks, support vector machines, and evolutionary algorithms have been applied to areas as diverse as cre...
-
作者：Ghosh-Dastidar, B; Schafer, JL
作者单位：RAND Corporation; Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania State University - University Park
摘要：Multiple imputation replaces an incomplete dataset with m > 1 simulated complete versions that are analyzed separately by standard methods. We present a natural extension of multiple imputation for handling the dual problems of nonresponse and response error. This extension, which we call multiple edit/multiple imputation (MEMI), replaces an observed dataset containing missing values and errors with m > 1 simulated versions of the ideal dataset that is complete and error-free. These ideal data...
-
作者：Hössjer, O
作者单位：Stockholm University
摘要：The aim of linkage analysis is to map the position of a gene contributing to an inheritable disease. The statistical model contains the disease allele frequency and penetrance parameters. Here I investigate the inheritance distribution, that is, the conditional distribution of the inheritance vector given phenotypes at the disease locus. Based on this, the likelihood and likelihood score function of Whittemore can be defined. As a result, a general semiparametric methodology of choosing score ...
-
作者：Johns, CJ; Nychka, D; Kittel, TGF; Daly, C
作者单位：University of Colorado System; University of Colorado Denver; National Center Atmospheric Research (NCAR) - USA; Oregon State University
摘要：Historical records of weather, such as monthly precipitation and temperatures from the last century, are an invaluable database to use in studying changes and variability in climate. These data also provide the starting point for understanding and modeling the relationship among climate, ecological processes, and human activities. However, these data are observed irregularly over space and time. The basic statistical problem is to create a complete data record that is consistent with the obser...
