-
作者：CWIK, J; GOLEMBIEWSKA, M; KOWALCZYK, T; PLESZCZYNSKA, E
作者单位：University of Warsaw
摘要：Statistical concepts needed to formalize and solve problems of sister dependence are surveyed. Notions and measures of stochastic codependence are considered, and the joint use of the correlation coefficient and the monotone dependence function are discussed. Remarks on planning the analysis of experiments on sister cells are given. The results of experiments on Chilodonella steini serve as an illustration.
-
作者：CHAN, NN
-
作者：HARRINGTON, DP; FLEMING, TR
作者单位：Mayo Clinic
摘要：A class of linear rank statistics is proposed for the k-sample problem with right-censored survival data. The class contains as special cases the log rank test (Mantel, 1966; Cox, 1972) and a test essentially equivalent to Peto and Peto''s (1972) generalization of the Wilcoxon test. Martingale theory is used to establish asymptotic normality of test statistics under the null hypotheses considered, and to derive expressions for asymptotic relative efficiencies under contiguous sequences of alte...
-
作者：DEMETS, DL; WARE, JH
作者单位：Harvard University; Harvard T.H. Chan School of Public Health
摘要：A group sequential method is proposed for the periodic analysis of accumulating data in clinical trials which are essentially 1-sided as in treatment-placebo studies. The proposed boundaries retain the early stopping properties of the procedure described previously by DeMets and Ware (1980) when treatment appears to be ineffective or harmful but incorporate the more stringent requirement of the model proposed by O''Brien and Fleming (1979) for early rejection of the null hypothesis in favor of...
-
作者：SHEN, SM
摘要：Until recently, only the Dirichlet class of distributions was available to describe compositional data, but now there is an alternative more flexible class of logistic normal distributions. To choose between these 2 classes requires methods for testing separate families of distributions, but application of the methods described in the literature involves extremely tedious calculation. A conceptually straightforward and computationally simpler method is introduced and illustrated.
-
作者：JEYARATNAM, S
-
作者：CHAO, MT
摘要：A general purpose unequal probability without replacement sampling plan with fixed sample size is presented. In contrast to existing plans, this scheme keeps the sample size fixed and lets the population units enter the sample 1 at a time through a carefully designed random mechanism. All high-order inclusion probabilities are easily computed.
-
作者：STEPHENS, MA
摘要：The von Mises distribution in p dimensions is suggested for the analysis of data which are proportions of a continuum such as time or volume. The 1-way analysis-of-variance technique developed by Watson (1956) is extended to a multiway layout and the methods are illustrated on data giving proportions of time spent in various activities [student''s activities].
-
作者：LASLETT, GM
摘要：Several situations involving [patient] survival data are examined, in which the nonparametric maximum likelihood estimator is not the Kaplan-Meier estimator. Cases covered are inclusion of initial observations in field studies, estimation of the length distribution from convex window sampling of line segment processes in 2 dimensions and estimation of a survival curve with monotone density. The first 2 case are nonstandard because survival and censoring are not independent and thus form simple...
-
作者：HILL, C
