Some Improved Combined Estimators of Population Mean in Stratified Ranked Set Sampling; [Algunos estimadores combinados mejorados de la media de la población en el muestreo de conjuntos clasificados estratificados]

Abstract

This paper presents improved population mean estimators using auxiliary variables in Stratified Ranked Set Sampling. We have derived the expres-sions for bias and mean square errors up to the first order of approximation and shown that the proposed estimators under optimum conditions are more efficient than other estimators taken in this paper. In an attempt to verify the efficiencies of proposed estimators, theoretical results are supported by numerical illustrations and simulation study for which we have considered two populations. © 2023, Universidad Nacional de Colombia. All rights reserved.