I fitted a model by rsm function in R, and here is the code:
rsm1 = rsm(x ~Block+FO(x1,x2,x3)+PQ(x1,x2,x3), data=t1.df)
The coefficients, obtained from the rsm1$coefficients function are:
(Intercept) = 0.990627264, Block2 = -0.069201060, FO(x1, x2, x3)x1 = 0.096171838 , FO(x1, x2, x3)x2 = 0.006456881, FO(x1, x2, x3)x3, -0.011316078, PQ(x1, x2, x3)x1^2 = -0.050611735, PQ(x1, x2, x3)x2^2 = -0.044424551, PQ(x1, x2, x3)x3^2 = -0.047076201
Then, RSM equation can be written like this:
y = 0.990627264 + (-0.069201060)Block + 0.096171838.x1 + 0.006456881.x2 - 0.011316078. x3 - 0.050611735.x1^2 - 0.044424551.x2^2 - 0.047076201.x3^2
How do I write the "Block" using x1, x2, x3......