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Journal of Probability and Statistics
Volume 2014, Article ID 723982, 5 pages
Research Article

A Study on the Chain Ratio-Type Estimator of Finite Population Variance

1Department of Statistics and Mathematical Sciences, Kwara State University, PMB 1530, Malete, Ilorin, Nigeria
2Department of Statistics, Hacettepe University, Beytepe, 06800 Ankara, Turkey

Received 12 August 2013; Revised 15 January 2014; Accepted 15 January 2014; Published 24 February 2014

Academic Editor: Shein-chung Chow

Copyright © 2014 Yunusa Olufadi and Cem Kadilar. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We suggest an estimator using two auxiliary variables for the estimation of the unknown population variance. The bias and the mean square error of the proposed estimator are obtained to the first order of approximations. In addition, the problem is extended to two-phase sampling scheme. After theoretical comparisons, as an illustration, a numerical comparison is carried out to examine the performance of the suggested estimator with several estimators.