Symmetry, Vol. 17, Pages 1127: Stratified Median Estimation Using Auxiliary Transformations: A Robust and Efficient Approach in Asymmetric Populations

Symmetry doi: 10.3390/sym17071127

Authors:
Abdulaziz S. Alghamdi
Fatimah A. Almulhim

This study estimates the population median through stratified random sampling, which enhances accuracy by ensuring the proper representation of key population groups. The proposed class of estimators based on transformations effectively handles data variability and enhances estimation efficiency. We examine bias and mean square error expressions up to the first-order approximation for both existing and newly introduced estimators, establishing theoretical conditions for their applicability. Moreover, to assess the effectiveness of the suggested estimators, five simulated datasets derived from distinct asymmetric distributions (gamma, log-normal, Cauchy, uniform, and exponential), along with actual datasets, are used for numerical analysis. These estimators are designed to significantly enhance the precision and effectiveness of median estimation, resulting in more reliable and consistent outcomes. Comparative analysis using percent relative efficiency (PRE) reveals that the proposed estimators perform better than conventional approaches.

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Abdulaziz S. Alghamdi www.mdpi.com