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作者：BOYS, RJ; DUNSMORE, IR
作者单位：University of Sheffield
摘要：Screening methods are developed which raise the proportion of successes in the retained population to a predetermined level. Specification regions for the screening variables are derived within both the diagnostic and sampling paradigms (Dawid, 1976). Logistic and normal models are used for the two frameworks and the results are illustrated by an example of screening for malnourishment.
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作者：GILL, R; SCHUMACHER, M
作者单位：University of Freiburg
摘要：A new test of the proportional hazards assumption for two-sample censored data is presented. The test is based on a comparison of different generalized rank estimators of the relative risk. Asymptotic normality and consistency against alternatives with monotone hazard ratio are shown and relationships to other proposals are pointed out. A related graphical method is presented and recommendations for the choice of appropriate weight functions are given. The strengths and weaknesses of the test ...
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作者：KREMERS, WK; ROBSON, DS
作者单位：Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania State University - University Park; Cornell University
摘要：Suppose random variables are sampled sequentially until the sum of associated nonnegative random variables is greater than or equal to a predetermined constant. When no distributional asumptions are made, we derive uniform minimum variance unbiased estimators for functions which are U-estimable in the fixed sample size case. We also consider estimation for some special cases when distributional assumptions are made. When estimating the mean and variance of random means, it is often assumed tha...
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作者：GOFFINET, B
摘要：It is demonstrated that, when a complete sufficient statistic exists, weaker conditions than those of Rubin (1976) are sufficient to allow one to make inferences about the sampling distribution in the case of missing data, where the process that causes missing data is not independent of the data. An example from animal breeding is presented.
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作者：DEWANJI, A; KALBFLEISCH, JD
作者单位：University of Waterloo
摘要：The EM algorithm is used to develop procedures for estimating the interoccurrence distributions when n independent and identically distributed cyclic semi-Markov processes, each being ergodic, irreducible and in equilibrium, are observed over finite windows. This work is an extension of Vardi (1982a, b) who considers a similar problem for renewal processes and develops the RT algorithm for estimation of the common interoccurrence distribution. The results are illustrated using simulations for ...
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作者：PICKANDS, J; RAGHAVACHARI, M
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作者：DOLBY, GR; CORMACK, RM; SINCLAIR, DF
作者单位：University of St Andrews; Commonwealth Scientific & Industrial Research Organisation (CSIRO)
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作者：LIANG, KY
作者单位：Imperial College London
摘要：A locally most powerful test is proposed for homogeneity of nuisance parameters from many strata in the mixed model setting. The test is based on the difference between the square of the score and the observed information about the nuisance parameters, all evaluated at the null hypothesis. Several examples including constant normal mean with possibly different variances and matched case-control studies are presented in detail. The relative efficiencies of the unstratified estimator of paramete...
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作者：MATTHEWS, JNS
摘要：A model for responses in a crossover experiment that includes direct and first-order carryover treatment effects, together with an autocorrelated error term, is considered when there are two treatments. A method for generating designs that minimize the variance of the estimated treatment effects is proposed and explicit results are given for the three and four period cases. Efficiencies of some practical designs are calculated.
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作者：PIGEON, JG; RAGHAVARAO, D
作者单位：Merck & Company; Pennsylvania Commonwealth System of Higher Education (PCSHE); Temple University
摘要：We introduce a class of crossover designs with residual effects for experimental situations in which primary interest centres on the comparison of several test treatments. We shall call these designs ''control balanced residual effects designs''. Their structure is studied in detail, some methods of their construction are given and their relative efficiencies are evaluated.
