Chapter 4 Stratified Sampling - IIT Kanpur
Sampling Theory| Chapter 4 | Stratified Sampling | Shalabh, IIT Kanpur Page 5 Now 1 1 1 () 1 k stii i k i i i Ey NEy N NY N Y Thus yst is an unbiased estimator of Y. Variance of yst 2 1()11 () (,). kkni sti i ij ij iijj Var y w Var y w w Cov y y
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