In order to estimate the unknown mean of a study variable using twoauxiliary variables, the efficiency of a modified version of the ratio-cum-productestimators is analysed when the sampling fraction is less then 0.5. Approximateexpressions for the bias and the mean square error are obtained and specificconditions under which the modified estimators are more efficient then the originalones are analytically defined. Also a comparison with the multivariate regressionestimator is included.
Alcune considerazioni sull'efficienza degli stimatori rapporto-cum-prodotto
PERRI, PIER FRANCESCO
2004-01-01
Abstract
In order to estimate the unknown mean of a study variable using twoauxiliary variables, the efficiency of a modified version of the ratio-cum-productestimators is analysed when the sampling fraction is less then 0.5. Approximateexpressions for the bias and the mean square error are obtained and specificconditions under which the modified estimators are more efficient then the originalones are analytically defined. Also a comparison with the multivariate regressionestimator is included.File in questo prodotto:
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