Biometrika

最新文章

• UNBIASED ESTIMATION WHEN SAMPLING FROM RENEWAL PROCESSES - THE SINGLE SAMPLE AND K-SAMPLE RANDOM MEANS CASES AI翻译
  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...
• METHODOLOGY FOR CASE-CONTROL STUDIES WITH PREVALENT CASES AI翻译
  作者：BEGG, CB; GRAY, RJ
  作者单位：Harvard University; Harvard University Medical Affiliates; Dana-Farber Cancer Institute; Harvard Medical School
  摘要：A method is developed for the analysis of case-control studies with prevalent cases. The method permits adjustments for potential bias induced by association of the exposure of interest and/or covariates with survival. The only additional information required is the time since diagnosis of each prevalent case. The method employs an accelerated life model, the parameters of which are estiamted using quasi-likelihood techniques. In this way, no assumptions are required about the random component...
• A NOTE ON THE PRODUCT-LIMIT ESTIMATOR UNDER RIGHT CENSORING AND LEFT TRUNCATION AI翻译
  作者：TSAI, WY; JEWELL, NP; WANG, MC
  作者单位：University of California System; University of California Berkeley; University of California System; University of California Berkeley; Johns Hopkins University
  摘要：In many applications involving follow-up studies, individuals'' lifetimes may be subject to left truncation in addition to the usual right censoring. Here we consider the product-limit estimator of the survival curve S or an appropriate conditional version of S. The asymptotic behaviour of the estimator is briefly described together with an example.
• ALTERNATIVE CONDITIONS FOR IGNORING THE PROCESS THAT CAUSES MISSING DATA AI翻译
  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.
• THE MUTUAL INDEPENDENCE HYPOTHESIS FOR CATEGORICAL-DATA IN COMPLEX SAMPLING SCHEMES AI翻译
  作者：PORTEOUS, BT
• CONDITIONAL SCORES AND OPTIMAL SCORES FOR GENERALIZED LINEAR MEASUREMENT-ERROR MODELS AI翻译
  作者：STEFANSKI, LA; CARROLL, RJ
  作者单位：University of North Carolina; University of North Carolina Chapel Hill
• RESPONSE MODELS AND MINIMAL DESIGNS FOR MIXTURES OF N OF M ITEMS USEFUL FOR INTERCROPPING AND OTHER INVESTIGATIONS AI翻译
  作者：FEDERER, WT; RAGHAVARAO, D
  作者单位：Pennsylvania Commonwealth System of Higher Education (PCSHE); Temple University
  摘要：Suppose that n of m cultivars are grown together in a mixture such as that found in intercropping investigations. Response model equations for n = 2 are formulated in a manner akin to that found for a diallel crossing experiment in genetics. This situation varies considerably from diallel crossing in that n .gtoreq. 2 and yields may or may not be available for each member of the mixture. Response model equations are formulated and then minimal treatment designs obtained to derive least-squares...
• THE BOOTSTRAP - TO SMOOTH OR NOT TO SMOOTH AI翻译
  作者：SILVERMAN, BW; YOUNG, GA
  作者单位：University of Cambridge
• ESTIMATION OF SOJOURN TIME DISTRIBUTIONS FOR CYCLIC SEMI-MARKOV PROCESSES IN EQUILIBRIUM AI翻译
  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 ...
• SENSITIVITY ANALYSIS FOR CERTAIN PERMUTATION INFERENCES IN MATCHED OBSERVATIONAL STUDIES AI翻译
  作者：ROSENBAUM, PR
  摘要：In observational studies, treatments are not randomly assigned to experiental units, so that randomization tests and their associated interval estimates are not generally applicable. In an effort to compensate for the lack of randomization, treated and control units are often matched on the basis of observed covariates; however, the possibility remains of bias due to residual imbalances in unobserved covariates. A general though simple method is proposed for displaying the sensitivity of permu...