Estimation of the population mean using random selection in ranked set samples

The use of ranked set sample to estimate the population mean is well known for its advantages over usual methods using simple random sample. In this paper we generalize the random selection in ranked set sampling proposed by Li et al. (J. Statist. Plann. Inf. 76 (1999) 185) to come up with estimator of the population mean. It will be shown that this estimator is more practical and more efficient in some cases.Normal distribution Ranked set sampling Simple random sampling