SOME MODIFIED EXPONENTIAL RATIO-TYPE ESTIMATORS IN THE PRESENCE OF NON-RESPONSE UNDER TWO-PHASE SAMPLING SCHEME

This paper addresses the problem of estimating the population mean using information on the auxiliary variable in the presence of non-response under two-phase sampling. On the lines of Bahl and Tuteja [1] and upadhyaya et al. [22], a class of modified exponential-ratio type estimators using single auxiliary variable have been proposed under two different situations of non-response of the study variable. The expressions for the bias and mean square error (MSE) of a proposed class of estimators are derived. Efficiency comparisons of a proposed class of estimators with the usual unbiased estimator by Hansen and Hurwitz [3] and other existing estimators are made. An empirical study has been carried out to judge the performances of the proposed estimators.