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作者：WAKAKI, H
摘要：Asymptotic expansions of the distributions of the linear and the quadratic discriminant functions are derived. The expected misclassification probabilities of these two functions are compared when the covariance matrices are proportional and the sample sizes are equal. Some numerical experiments are carried out to investigate the relation between the parameters and the boundary point such that if the sample size is smaller than the point the linear discriminant function is better than the quad...
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作者：LANGHOLZ, B; THOMAS, D; CHEN, TJ; RHODES, P
作者单位：Centers for Disease Control & Prevention - USA
摘要：A test of an effect in matched case-control studies, natural in an analysis of variance context, compares within matched set case-control mean differences to the within matched set variances after removing the case-control effect. For large odds ratios, heuritis reasoning suggests that this new test should be more powerful than the standard score test when two or more controls are matched to any case. Asymptotic theory confirms this in some important situations. Simulation results reveal, howe...
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作者：TAWN, JA
摘要：Multivariate extreme value distributions arise as the limiting joint distribution of normalized componentwise maxima/minima. No parametric family exists for the dependence between the margins. This paper extends to more than two variables the models and results for the bivariate case obtained by Tawn (1988). Two new families of physically motivated parametric models for the dependence structure are presented and are illustrated with an application to trivariate extreme sea level data.
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作者：YING, ZL
摘要：Motivated by Prentice''s (1978) generalization of linear rank statistics for censored data, we introduce a similar kernal for deriving linear rank statistics or truncated data. They take very similar forms to those of Prentice''s statistics. Moreover, we also show that they can be expressed equivalently in weighted log rank-type forms, thus providing natural variance estimators. Explicit forms corresponding to Wilcoxon and log rank tests are obtained. Extensions to data subject to both left tr...
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作者：KUK, AYC
摘要：We propose a new method for conducting surveys on sensitive topics which does not require direct answers from the respondents. It overcomes some of the difficulties associated with traditional randomized response techniques and is applicable to both qualitative and quantitative characteristics. Data collected using the proposed method are distributed according to a mixture distribution and the problem reduces to that of estimating a mixing proportion or a mixing distribution. The method can be...
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作者：MANGAT, NS; SINGH, R
作者单位：Punjab Agricultural University
摘要：The paper considers a new randomized response procedure. The proposed method requires the use of two randomization devices. The conditions when the proposed strategy will be more efficient than the usual Warner''s strategy have been obtained for the cases when the respondents are truthful and when they are not completely truthful in their answers.
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作者：WEI, LJ; SU, JQ; LACHIN, JM
作者单位：George Washington University
摘要：In comparing two treatments, suppose that patients are available for the study sequentially. Repeated measurements of the same characteristic are collected serially over time for each study patient. Sequential procedures are proposed to monitor the trial for early evidence of treatment difference or harmful side effects based on such repeated measurements. All the methods are illustrated with a real-life example.
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作者：GOWER, JC
摘要：The biplot of a two-way table is discussed as a diagnostic tool for investigating bilinear models with additive terms for rows and columns and at least one multiplicative term. The full biplot is three dimensional with the points representing row effects concentrated in a plane orthogonal to another plane containing the points representing the column effects. Projections onto suitable directions in these planes give the row, column and multiplicative constants of the model. Extensions to more ...
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作者：BROWN, EN
摘要：The harmonic regression signal plus noise model is used extensively in applied statistics. This note establishes the joint asymptotic normality of the generalized least squares estimates of the harmonic regression parameters and gives an explicit expression for the limiting covariance matrix. It also clarifies misstatements concerning the model''s properties that have appeared in the literature.
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作者：BERMAN, SM
摘要：A mathematical model is proposed for the description of the T4 level, as a function of the time since initial infection, in the blood of an HIV-infected individual. Two random variables are defined for each infected individual, the time T from the moment of infection to the moment when the infection is first discovered, and the level R of T4 cells in the blood at the time of the discovery. Here T is the length of the latency period, and is not typically observable. On the basis of a stochastic...
