2017-11-12 01:05 回答问题
Y = a + b1*X1 + b2*X2 + b3*X3 = a + b1*X1 + b2*X2 + (1-b1-b2)*X3 = a + b1*(X1-X3) + b2*(X2-X3) + X3 Y-X3 = a + b1*(X1-X3) + b2*(X2-X3)