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This study is devoted to obtain an ecient estima-tor for population mean in two-phase sampling using two auxiliaryÂ variables following Vishwakarma and Kumar (2014). ExpressionsÂ for bias and mean squared error(MSE) are obtained to rst or-der of approximation. The new proposed estimator is comparedÂ with some competitor estimators both theoretically and numeri-cally using eight dierent data sets. It has been shown that theÂ new proposed estimator gives more ecient results as compared toÂ its competitor estimators.
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