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Simple regression vs multiple regression

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Reference no: EM131449613

Simple regression vs multiple regression:

model 1: y=b0+b1x1+u

model 2: y=b0+b1x1+b2x2+b3x3+b4x4+u

Why model 2 in theory is better than model 1 even if the main concern is estimation of the impact of factor X1?

Reference no: EM131449613

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