On Efficient Estimation of the Population Mean under Stratified Ranked Set Sampling

This paper considers some efficient combined and separate classes of estimators of the population mean in the presence of bivariate auxiliary information under stratified ranked set sampling. The mean square error MSE expressions of the proffered combined and separate classes of estimators are derived to the first order of approximation. The theoretical conditions are obtained under which the proffered combined and separate classes of estimators perform better than the existing combined and separate class of estimators. Subsequently, numerical and simulation studies are performed using real and artificially generated populations. The numerical and simulation results are found to be rewarding, showing the superiority of the proffered estimators over the existing estimators.

Automated summary

This paper considers efficient combined and separate classes of estimators for population mean estimation in stratified ranked set sampling with bivariate auxiliary information. The mean square error expressions of the proposed estimators are derived and conditions for their superiority over existing estimators are obtained. Numerical and simulation studies with real and artificially generated populations support the superiority of the proposed estimators.