An Addendum to “Regression Estimator in Ranked Set Sampling by Yu and Lam”
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Yu and Lam (Biometrics 53:1070–1080, 1997) proposed a regression estimator for the two-phase sampling procedure in ranked set sampling. The variance expression of their proposed regression estimator seems to be incorrect. In this note, the variance of the regression estimator is corrected.
KeywordsOrder statistics Ranked set sampling Relative efficiency Sampling with replacement Two-phase sampling
Mathematics Subject Classification62D05
The authors are thankful to the two learned reviewers for their valuable comments which lead to substantial improvement in the earlier version of this paper. This article was finalized during the R & D leave granted to the third author by the University of South Africa. The views expressed in this paper are those of the authors alone, and they do not necessarily reflect the views of the University of South Africa.
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Conflict of interest
The authors have no conflict of interest.
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