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Biostatistics and Research Methodology - Regression
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Regression Analysis
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• Example-2
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Deviation method from
mean • Regression equation for X on Y X- x̄ = bxy (Y-ȳ ), Where bxy is the regression co- efficient and bxy= • Regression equation for Y on X Y-ȳ ̄ = bxy (X- x̄), Where bxy is the regression co-efficient and byx=
14.
Example-1 X Y (X-
x ̄ ) (Y- ȳ) (X-x ̄ )2 (Y-ȳ)2 (X- x ̄ ) (Y- ȳ) 2 8 -3 -4 9 16 12 8 12 3 0 9 0 0 6 16 1 4 1 16 4 4 14 -1 2 1 4 -2 5 10 0 -2 0 4 0 ΣX= 25 Σy= 60 Σ(X-x̄)2= 20 Σ(Y- ȳ)=40 Σ(X- x ̄ ) (Y- ȳ) = 14 x̄= 25/= 5 , bxy= 14/40= 0.35 ȳ= 60/5=12 , byx = 14/20= 0.7 X on Y Y on X x-5= 0.35(y-12) y-12= 0.7 ( x-5) x= 0.35y- (0.35x12)+5 y= 12+0.7x- (0.7x 5) x= 0.35 y- 4.2+5 y= 0.7x- 3.5+12 X= 0.35y+0.8 y= 0.7x+8.5
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