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Enhancement of Exponential Ratio-Type and Product-Type Estimators in Two-Phase Sampling

N. Sahoo, S K Jhankar


In this study, we have proposed an exponential ratio-type and product-type estimators to estimate the mean of study variable Y by incorporating auxiliary variable under two-phase sampling scheme. The expression of mean square error has been obtained up to the first order of approximation and an empirical study carried out to show the superiority of our proposed estimators. It is observed that the estimators considered by various authors and usual unbiased estimator are less efficient than our proposed estimators. For the theoretical support a simulation study is also carried out.


Simple random sampling, mean square error, two-phase sampling and simulation study.

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