Methacrylate model for samples polymerizing to hardness. SAM1 statistics include: N=8, R2=0.993, R2adj=0.995, R2CV=0.972, F=339, RMSE=0.2, s2=0.1, t-test >4, VIF=1.0, p significance ≤ 0.005. Hartree Fock statistics include: R2=0.997, R2adj=0.932, R2CV=0.988, F=773, RMSE=0.1, s2=0.03, t-test >4, VIF=1.0, p significance ≤ 0.005.