多元回归方程求偏导数?
本人对数学一窍不通,如题:多元回归方程为:Y=0.5+0.001X1+0.007125X2+0.042X3+0.0015X1X2-0.013X1X3-0.00475X2X3-0.04X12-0.012X22-0.006475X32分别求X1、X2、X3的偏导数,...