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150 KKU Science Journal Volume 39 Number 1 <strong>Review</strong> (Sampling Techniques) (Estimator) Y (Population Mean) y (Sample Mean) (Ratio Estimator) y R (Regression Estimator) y lr S 2 (Population Variance) S 2 (Sample Variance) P (Population Proportion) p (Sample Proportion) n N n y i i=1 y= n (auxiliary variable: x) Y (Traditional Ratio Estimator ) y x X y y= R X (1) x
∫∑§«“¡ «“√ “√«‘∑¬“»“ µ√å ¡¢. ªï∑’Ë 39 ©∫—∫∑’Ë 1 151 (Mean Square Error : MSE) 1 f MSE(y R ) (R2S22RS S S2 n x x y y ) (2) S 2 x x S 2 y y y y x R x Ochran (1977) y R ( consistent) Y X 1 y R y Cx y 2 Cy X X y lr =y+b(X-x) (3) 1 f MSE(y lr ) S 2(1 2 y ) (4) n Y X y lr y y lr y R R S y / S x x (Coefficient of Variation: C x ) (Coefficient of Kurtosis: 2 (x)) (Coefficient of Correlation : xy ) (Population Total : X ) (Min: X min ) (Max: X max ) Mohanty and Sahoo (1995) X
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