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Improved Class of Estimators for Variance under Single And Two Phase Sampling |
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PP: 161-171 |
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Author(s) |
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Rajesh Singh,
Viplav Kumar Singh,
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Abstract |
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In this paper improved class of estimators for estimating
2
y S is proposed adapting [6] and [7]. We have also extended our
study to the case of two phase sampling. The asymptotic expressions for the mean square error and their optimum values have been
derived up to the first order of approximation. The theoretical conditions have also been verified by numerical examples. After deep
inspection, it has been shown that the proposed estimators are more efficient than usual unbiased estimator, chain ratio estimator and
regression estimator. |
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