Comparing accuracy of estimators

safina
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May I ask what is needed to be computed in order to compare the estimators of the population mean \bar{y}_{N}, in terms of accuracy? That is to compare the multivariate ratio estimator \bar{y}_{RM} with the Y-only estimator \bar{y}_{n} in terms of accuracy.
 
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The variance of an estimator is often used to quantify its "accuracy". Are you asking how to compute the variance of various estimators of the population mean?

I'm not familiar with the multivariate ratio estimator or the Y-only estimator. Can you describe them?
 

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