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作者：Hardwick, J; Page, C; Stout, QF
作者单位：Purdue University System; Purdue University; Michigan State University; University of Michigan System; University of Michigan
摘要：To estimate a success probability p, two experiments are available: individual Bernoulli (p) trials or the product of r individual Bernoulli (p) trials. This problem has its roots in reliability where either single components can be tested or a system of r identical components can be rested. A total of N experiments can be performed, and the problem is to sequentially select some combination (allocation) of these two experiments, along with an estimator of p, to achieve low mean squared error ...
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作者：Agresti, A
作者单位：State University System of Florida; University of Florida
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作者：Rotnitzky, A; Robins, JM; Scharfstein, DO
作者单位：Harvard University; Harvard T.H. Chan School of Public Health; Johns Hopkins University
摘要：We consider inference about the parameter beta* indexing the conditional mean of a vector of correlated outcomes given a vector of explanatory variables when some of the outcomes are missing in a subsample of the study and the probability of response depends on both observed and unobserved data values; that is, nonresponse is nonignorable. We propose a class of augmented inverse probability of response weighted estimators that are consistent and asymptotically normal (CAN) for estimating beta*...
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作者：Cohen, J; Nagin, D; Wallstrom, G; Wasserman, L
作者单位：Carnegie Mellon University; Carnegie Mellon University; University of Minnesota System; University of Minnesota Twin Cities
摘要：A Bayesian hierarchical model provides the basis for calibrating the crimes avoided by incarceration of individuals convicted of drug offenses compared to those convicted of nondrug offenses. Two methods for constructing reference priors for hierarchical models both lead to the same prior in the final model. We use Markov chain Monte Carlo methods to fit the model to data from a random sample of past arrest records of all felons convicted of drug trafficking, drug possession, robbery, or burgl...
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作者：Haas, PJ; Stokes, L
作者单位：International Business Machines (IBM); IBM USA; University of Texas System; University of Texas Austin
摘要：We use an extension of the generalized jackknife approach of Gray and Schucany to obtain new nonparametric estimators for the number of classes in a finite population of known size. We also show that generalized jackknife estimators are closely related to certain Horvitz-Thompson estimators, to an estimator of Shlosser, and to estimators based on sample coverage. In particular, the generalized jackknife approach leads to a modification of Shlosser's estimator that does not suffer from the erra...
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作者：Maitra, R; O'Sullivan, F
作者单位：University System of Maryland; University of Maryland Baltimore County; University College Cork
摘要：The problem of variance assessment for positron emission tomography (PET) image reconstructions is considered in the context of generalized deconvolution. A refinement of an approximate technique proposed by Carson and colleagues is examined. Computational implications of representing the reconstruction kernel in terms of a weighted sum of Gaussian densities are developed. Bias and variance characteristics of the resulting variance estimators are examined by numerical simulation. For typical r...
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作者：Paul, SR; Banerjee, T
作者单位：University of Windsor; University of Calcutta
摘要：Multiple counts may occur in each cell of an a x b two-way layout (balanced or unbalanced) of two fixed factors A and B. Standard log-linear model analysis based on a Poisson distribution assumption of the cell counts is not applicable here, because of the unbalanced nature of the table or because the Poisson distribution assumption is not valid. We develop C(alpha) tests for interaction and main effects assuming data to be Poisson distributed and also assuming that data within the cells have ...
