Simple vs multiple reg estimate Compare the simple regression y=Bo+B,x, with the multiple regression y=Bo+B,,+B2x2 Genera,B1≠ B, unless: B,=0(ie. no partial effect of x,OR x, and x, are uncorrelat ed in the sample Economics 20- Prof anderson 6Economics 20 - Prof. Anderson 6 Simple vs Multiple Reg Estimate and are uncorrelat ed in the sample ˆ 0 (i.e. no partial effect of ) O R unless : ˆ ~ Generally, ˆ ˆ ˆ with the multiple regression ˆ ~ ~ ~ Compare the simple regression 1 2 2 2 1 1 0 1 1 2 2 0 1 1 x x x y x x y x =  = + + = + b b b b b b b b