Estimation of population mean in two-phase successive sampling

In the present work an attempt to estimate population mean on the current occasion using two-phase successive (rotation) sampling on two occasions has been made. Two-phase ratio, regression and regression-type estimators for estimating the population mean on current (second) occasion have been proposed. Optimum replacement policies of the proposed estimators have been discussed. The proposed estimator are compared with sample mean estimator when there is no matching and the optimum estimator which is a linear combination of the means of the matched and unmatched portions of the sample at the current occasion. Empirical studies are carried out and suitable recommendations are made.