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791.
Three simple transformations are proposed in the context of ratio and product methods of estimation, based on any probability sampling design, and the usual unbiased estimation under varying probability sampling. These transformations may be effected after the data are collected in a survey. The objective is to obtain improved estimators of the population total 相似文献
792.
T. Mikosch 《Statistics》2013,47(1):117-121
793.
ABSTRACTThe article suggests a class of estimators of population mean in stratified random sampling using auxiliary information with its properties. In addition, various known estimators/classes of estimators are identified as members of the suggested class. It has been shown that the suggested class of estimators under optimum condition performs better than the usual unbiased, usual combined ratio, usual combined regression, Kadilar and Cingi (2005), Singh and Vishwakarma (2006) estimators and the members belonging to the classes of estimators envisaged by Kadilar and Cingi (2003), Singh, Tailor et al. (2008), Singh et al. (2009), Singh and Vishwakarma (2010) and Koyuncu and Kadilar (2010). 相似文献
794.
Yongfeng Wu 《统计学通讯:理论与方法》2013,42(20):5977-5989
ABSTRACTThe authors discuss the convergence for weighted sums of pairwise negatively quadrant dependent (NQD) random variables and obtain some new results which extend and improve the result of Bai and Cheng (2000). In addition, we relax some restrictions of the conditions in their result. Some new methods are used in this article which differ from that of Bai and Cheng (2000). 相似文献
795.
Analysis of categorical data by linear models is extended to data obtained by stratified random sampling. It is shown that, asymptotically, proportional allocation reduces the variances of estimators from those obtained hy simple random sampling. The difference between the asymptotic covariance matrices of estimated parameters obtained by simple random sampling and stratified random sampling with proportional allocation is shown to be positive definite vinder fairly non-restrictive conditions, when an asymptotically efficient method of estimation is used. Data from a major community study of mental health are used to illustrate application of the technique. 相似文献
796.
Mohamed M. Shoukri 《统计学通讯:理论与方法》2013,42(17):1919-1934
In an expository paper, Siddiqui (1962), presented and investigated the origin of the Rayleigh Power Distribution.He also discussed the problems of estimation and fitting the distribution to some numerical data. In this article we discuss two problems connected with the Rayleigh Amplitude Distribution (RAD). The first is an extension to the work done by Siddiqui on estimation, where the second is concerned with testing the equality of several Rayleigh Amplitude Distributions, and in this context we derive the asymptotic null distribution of the test criterion. 相似文献
797.
The maximum likelihood equations for a multivariate normal model with structured mean and structured covariance matrix may not have an explicit solution. In some cases the model's error term may be decomposed as the sum of two independent error terms, each having a patterned covariance matrix, such that if one of the unobservable error terms is artificially treated as "missing data", the EM algorithm can be used to compute the maximum likelihood estimates for the original problem. Some decompositions produce likelihood equations which do not have an explicit solution at each iteration of the EM algorithm, but within-iteration explicit solutions are shown for two general classes of models including covariance component models used for analysis of longitudinal data. 相似文献
798.
Nonparametric estimation of the probability density function f° of a lifetime distribution based on arbitrarily right-censor-ed observations from f° has been studied extensively in recent years. In this paper the density estimators from censored data that have been obtained to date are outlined. Histogram, kernel-type, maximum likelihood, series-type, and Bayesian nonparametric estimators are included. Since estimation of the hazard rate function can be considered as giving a density estimate, all known results concerning nonparametric hazard rate estimation from censored samples are also briefly mentioned. 相似文献
799.
Mrs. Shailaja R. Deshmukh 《统计学通讯:理论与方法》2013,42(14):1769-1780
The individuals of a population reproduce according to either the line arbirth process or the line arbirth- death process and simultaneously and independently migrate on the set of all integers according to a random walk in continuous time. The maximum likelihood estimators of the transition rates are obtained and their finite time and asymptotic properties are studied. 相似文献
800.
S. Shirahata 《统计学通讯:理论与方法》2013,42(7):1685-1692
In this paper, asymptotic properties of the Kruskal-Wallis test in the one-way analysis of variance model and that of the Friedman test in the two-way classification model are investigated under alternatives when the treatment effects are random. It is shown that the asymptotic distribution of each statistic is the same as a mixture of central chi-squared variables. Asymptotic comparisons of the tests with respect to their parametric competitors are also performed 相似文献