Browsing by Author "A.A. Adewara"

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A class of estimators for assessing the population mean under non-response using auxiliary information
(2012) M.K. Chaudhary; R. Singh; M. Kumar; A. Kr. Singh; A.A. Adewara
Khoshnevisan and some researchers in 2007 proposed a general family ofestimators for assessing the population mean of the variable under study. In this paper, their estimator is studied in the presence of non-response. An empirical study was carried out to demonstrate the performance of the suggested estimator and it was found that the empirical results supported the theoretical study.
An improved estimator for the population mean using additional information
(2012) M. Kumar; R. Singh; A.A. Adewara
An improved estimator that made use of information on auxiliary variables and variables of interest which was not drawn up yet was proposed to estimate the population mean of the variable under study. Under simple random sampling without replacement, the mean square error up to the first order of approximation was derived. An empirical study was also carried out to show the properties and efficiency of the proposed estimator.