Abstract
In this paper we study the problem of reducing the bias of the ratio estimator of the population mean in a ranked set sampling (RSS) design. We first propose a jackknifed RSS-ratio estimator and then introduce a class of almost unbiased RSS-ratio estimators of the population mean. We also present an unbiased RSS-ratio estimator of the mean using the idea of Hartley and Ross (Nature 174:270–271, 1954) which performs better than its counterpart with simple random sample data. We show that under certain conditions the proposed unbiased and almost unbiased RSS-ratio estimators perform better than the commonly used (biased) RSS-ratio estimator in estimating the population mean in terms of the mean square error. The theoretical results are augmented by a simulation study using a wheat yield data set from the Iranian Ministry of Agriculture to demonstrate the practical benefits of our proposed ratio-type estimators relative to the RSS-ratio estimator in reducing the bias in estimating the average wheat production.
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References
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The research work of M. Jafari Jozani and F. Perron were partially supported by the Natural Sciences and Engineering Council of Canada.
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Jafari Jozani, M., Majidi, S. & Perron, F. Unbiased and almost unbiased ratio estimators of the population mean in ranked set sampling. Stat Papers 53, 719–737 (2012). https://doi.org/10.1007/s00362-011-0376-3
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DOI: https://doi.org/10.1007/s00362-011-0376-3
Keywords
- Almost unbiased
- Auxiliary variable
- Jackknife
- Ranked set sampling
- Ratio estimator
- Relative efficiency
- Simple random sampling