摘要：In this paper, we have considered the problem of estimation of ratio of two population means (R) using multivariateauxiliary characters with known population means under incomplete information. Following Tripathi(1970) and Tripathi and Chaturvedi (1979), general classes of estimators for estimating R using multi-variateauxiliary characters under incomplete information have been proposed and their properties are studied.Th e expressions of the conditions for attaining minimum mean square error of the proposed classes of estimatorshave been derived and the minimum values of their mean square errors are given. Th e justifi cation forusing the proposed classes of estimators has been given effi ciently with the help of theoretical and empiricalstudies.
关键词：Ratio; auxiliary characters; bias; mean square error; incomplete information
