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In this paper, consider dual to ratio estimator for estimating mean using auxiliary information on both occasions in successive sampling scheme. Dual to ratio estimators have been developed by Srivenkataramana (1980) under simple random sampling. Using this estimator under successive sampling scheme, the bias and mean squared error are obtained upto the first order of approximation and show theoretically that the proposed estimator is more efficient than the Cochran’s estimator using no auxiliary variable and simple mean per unit estimator. Optimum replacement strategy is also discussed. Results have been justified through empirical interpretation.

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