%0 Journal Article %T Some Improved Multivariate-Ratio-Type Estimators Using Geometric and Harmonic Means in Stratified Random Sampling %A Sachin Malik %A Rajesh Singh %J ISRN Probability and Statistics %D 2012 %I Hindawi Publishing Corporation %R 10.5402/2012/509186 %U http://dx.doi.org/10.5402/2012/509186