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作者：SCOTT, AJ; WILD, CJ
摘要：Prentice and Pyke (1979) have shown that valid estimators of the odds-ratio parameters in a logistic regression model may be obtained from case-control data by fitting the model as if the data had been obtained in a prospective study. The resulting estimates of standard errors are also valid asymptotically. We extend the Prentice-Pyke result to likelihood ratio tests obtained from fitting a prospective model. These tests are asymptotically exact if the hypothesis involves only the odds-ratio p...
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作者：DABROWSKA, DM; DOKSUM, KA; SONG, JK
作者单位：University of California System; University of California Berkeley; Kyungpook National University (KNU)
摘要：We consider graphs, confidence procedures and tests that can be used with censored survival data to compare the hazard experience of a treatment group with that of a control group. In particular, we consider the relative change .DELTA.(t) in a cumulative rate function which is used to define a generalized proportional hazard model. This model is equivalent to the model obtained by introducing a gamma distributed frailty term in the proportional hazard model. We introduce an estimate .cxa..DELT...
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作者：ROY, R
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作者：SINGH, AC; SUTRADHAR, BC
作者单位：Memorial University Newfoundland
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作者：AITCHISON, J; HO, CH
摘要：The statistical analysis of multivariate counts has proved difficult because of the lack of a parametric class of distributions supporting a rich enough correlation structure. With increasing availability of powerful computing facilities and obvious candidate for consideration is now the multivariate log normal mixture of independent Poisson distributions, the multivariate Poisson-log normal distribution. The properties of this discrete multivariate distribution are studied and its uses in a v...
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作者：BESAG, J; CLIFFORD, P
作者单位：University of Oxford
摘要：Simple Monte Carlo significance testing has many applications, particularly in the preliminary analysis of spatial data. The method requires the value of the test statistic to be ranked among a random sample of values generated according to the null hypothesis. However, there are situations in which a sample of values can only be conveniently generated using a Markov chain, initiated by the observed data, so that independence is violated. This paper described two methods that overcome the prob...
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作者：SRIVENKATARAMANA, T; TRACY, DS
作者单位：University of Windsor
摘要：Sarndal and Swensson (1987) have given a general framework of estimation in two-phase sampling assuming arbitrary probability by sampling designs in both the phases where the selections are without replacement. This not discusses a specific with replacement version of the scheme where a ratio of two variables is suggested as a measure of size of the units and a mean of the ratios-type estimator is proposed. A comparison is made with the Raj (1965) scheme employing the difference method of esti...
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作者：BARNDORFFNIELSEN, OE; JAMES, IR; LEIGH, GM
作者单位：University of Western Australia; Commonwealth Scientific & Industrial Research Organisation (CSIRO)
摘要：A semiparametric estimator of natural mortality, introduced by Hearn, Sandland and Hampton (1987), was studied by Leigh (1988), who noted that its asymptotic variance may sometimes be infinite. We discuss the nonnormal asymptotic behaviour that can occur in this case, and remark on difficulties that it causes in practice.
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作者：MUKERJEE, R; SENGUPTA, S
作者单位：University of Calcutta
摘要：Restricting attention to fixed size sampling designs and linear unbiased estimators of a finite population total, we give methods for findings estimators with minimum model expected variance and the optimal strategy under a general correlated superpopulation model. Some techniques popular in the theory of optimal experiments help in the derivation. Several earlier optimality results are deduced as special cases.
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作者：VARDI, Y
摘要：This paper derives the nonparametric maximum likelihood extimate for a lifetime distribution G, under the following ''multiplicative-censorship'' model: X1,...,Xm are complete uncensored observations from G, and Y1,..., Yn are incomplete observations from G. The incompleteness of the Yi''s is assumed to come from the following censoring mechanism. For each Yi there exists and unobserved parent-observation'' Zi, distributed according to G, and Yi is the product of Zi and an independent uniform ...
