Using the known coefficient of variation of the study character, improved ratio in regression type estimator for population mean in the presence of non-response has been proposed and their properties have been studied. The conditions under which the proposed estimator is more efficient than the relevant estimators have been obtained. The empirical studies have been given in the support of the problems in the case of positive and negative correlation between the study and the auxiliary characters which show the increase in the efficiency of the proposed estimator using known coefficient of variation of the study character with respect to the relevant estimators.
Population mean, Study variable, Coefficient of variation, Non-response.
B. B. Khare; Habib Ur Rehman, Improved Ratio in Regression Type Estimator for Population Mean Using Known Coefficient of Variation of the Study Character in the Presence of Non-Response, HCTL Open International Journal of Technology Innovations and Research (IJTIR), Volume 14, April 2015, eISSN: 2321-1814, ISBN (Print): 978-1-62951-946-3.