共查询到20条相似文献,搜索用时 31 毫秒
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AGARWAL and KUMAR (1980) proposed an estimator, combining ratio and pps estimators of population mean and proved that the proposed estimator would always be better (in minimum mean square error sense) than the pps estimator or the ratio estimator under pps sampling scheme for optimum value of constant k (parameter). The optimum value of k is rarely known in practice, hence the alternative is to replace k from the sample-values. In this paper, an estimator depending on estimated optimum value of k based on sample-values, under pps sampling scheme is proposed and studied. 相似文献
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R. Karan Singh 《Biometrical journal. Biometrische Zeitschrift》1983,25(2):193-200
For estimating finite population variance σy2 of a character y under our study, estimators using auxiliary information on a character x in the form of ratio, product, ratio-type or product-type estimators have been suggested, and their comparative study with the conventional unbiased estimator sy2 of σy2 has been made in simple random sampling with replacement. A generalized estimator representing a class of estimators for the finite populations variance, has also been studied. 相似文献
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Logically defined outcomes are commonly used in medical diagnoses and epidemiological research. When missing values in the original outcomes exist, the method of handling the missingness can have unintended consequences, even if the original outcomes are missing completely at random. In this note, we consider 2 binary original outcomes, which are missing completely at random. For estimating the prevalence of a logically defined "or" outcome, we discuss the properties of 4 estimators: the complete-case estimator, the available-case estimator, the maximum likelihood estimator (MLE), and a moment-based estimator. With the exception of the available-case case estimator, all the estimators are consistent. The MLE exhibits superior performance and should be generally adopted. 相似文献
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This paper generalizes the results of AGARWAL (1980) and AGARWAL and KUMAR (1985) by constructing a multivariate ratiotype estimator which, to a first order of approximation, is as efficient as the regression estimator. 相似文献
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Victoire Tankou Sudhakar Dharmadhikari 《Biometrical journal. Biometrische Zeitschrift》1989,31(7):795-802
This paper proposes a method for using multi-auxiliary information at both the design and the estimation stages of a sample survey. The proposed method is an extension of the classical multivariate method of Olkin (1958). The results of Agarwal and Kumar (1978) come out as a special case. 相似文献
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A Buckley-James-type estimator for the mean with censored data 总被引:2,自引:0,他引:2
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A theorem of Jacobi and its generalization 总被引:1,自引:0,他引:1
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A class of almost unbiased ratio estimators for population mean σ is derived by weighting sample σ = (1/n) σ yi, ratio estimators σ and an estimator, σ (yi/xi). It is shown that NIETO DE PASCUAL (1961) estimator is a particular member of the class and an optimum estimator in the class (in the minimum variance sense) is identified. The results are illustrated through two numerical examples. 相似文献
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Igor Vajda 《Biometrical journal. Biometrische Zeitschrift》1989,31(7):803-810
Estimators of location are considered. Huber (1964) introduced estimators asymptotically minimax on the set ?? of all regular M-estimators, for a given contamination ε and for the set Q of all regular symmetric alternative data sources. We extend his concept by admitting arbitrary sets ?? of regular M-estimators and arbitrary sets Q or regular symmetric alternative sources, and also by replacing the singletons [ε] ? (0, 1) by arbitrary subsets ?? ? (0, 1). The resulting estimator cannot in general be evaluated explicitly. But for finite T it exists and, if ?? and Q are finite too, it may be chosen by a computer. This extra burden is justified in some cases since more than 100% relative efficiency gain against all Huber's Hk is achievable in this manner. Such gains are achieved for a nontrivial family Q by the estimator proposed in Vajda (1984), with redescending influence curve, which is shown to be asymptotically minimax in wide sense. 相似文献
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A new predictive product estimator 总被引:1,自引:0,他引:1
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Product method of estimation (MURTHY, 1964) using supplementary information on an auxiliary variable having high negative correlation with the main variable under our study, is well known. In this paper, we propose product-cum-difference method of estimation for the population total and the product of population parameters when supplementary information is available on two auxiliary variables. A comparison of product-cum-difference method of estimation with the usual product method of estimation using single auxiliary character and the estimators by SINGH (1965) for the estimation of product of population parameters has been made along with an empirical study. 相似文献
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Patrick D. Mauldin 《Biometrical journal. Biometrische Zeitschrift》1992,34(8):1013-1015
This Note expands the difference estimator developed by GRILICHES and HAUSMAN (1986) to the case of many independent variables, all having errors-in-variables. 相似文献
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P. Kaur 《Biometrical journal. Biometrische Zeitschrift》1985,27(7):831-835
For the estimation of finite population variance of a character, DAS and TRIPATHI (1978) proposed some efficient estimators when population mean of variance of some other character (associated with main character) is known. We propose here some estimators for population variance using same information and compare with those given by DAS and TRIPATHI (1978). Some examples are given for illustration. 相似文献
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Estimating the loss of estimators of a binomial parameter 总被引:2,自引:0,他引:2
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The derivation of the restricted intra-sire regression heritability estimator is provided. Procedures for obtaining a stable estimate of residual error variance σ2 are outlined. A small illustration based on live data is given. 相似文献