Table 4.
Statistical results for all CoMFA models obtained with and without the region focus.
No. Focus | d h = 0.3 | w = 0.5 | |||||||
d i = 0.5 | d = 1.0 | d = 1.5 | d = 2.0 | d = 0.5 | d = 1.0 | d = 1.5 | d = 2.0 | ||
q2LOO a | 0.64 | 0.76 | 0.83 | 0.81 | 0.73 | 0.82 | 0.89 | 0.86 | 0.62 |
SEP b | 0.18 | 0.15 | 0.13 | 0.14 | 0.14 | 0.13 | 0.11 | 0.12 | 0.18 |
N c | 5 | 5 | 6 | 5 | 5 | 6 | 6 | 6 | 3 |
r 2 d | 0.99 | 0.99 | 0.99 | 0.99 | 0.99 | 0.99 | 0.99 | 0.99 | 0.93 |
SEE e | 0.02 | 0.01 | 0.01 | 0.03 | 0.03 | 0.02 | 0.02 | 0.02 | 0.08 |
S f | 0.53 | 0.49 | 0.50 | 0.52 | 0.52 | 0.53 | 0.52 | 0.55 | 0.58 |
E g | 0.77 | 0.51 | 0.50 | 0.48 | 0.48 | 0.48 | 0.48 | 0.45 | 0.42 |
w = 0.7 | w = 0.9 | ||||||||
d = 0.5 | d = 1.0 | d = 1.5 | d = 2.0 | d = 0.5 | d = 1.0 | d = 1.5 | d = 2.0 | ||
q 2 LOO | 0.72 | 0.81 | 0.28 | 0.05 | 0.12 | 0.68 | 0.08 | 0.28 | |
SEP | 0.16 | 0.13 | 0.24 | 0.24 | 0.28 | 0.18 | 0.27 | 0.23 | |
N | 4 | 6 | 2 | 2 | 5 | 6 | 1 | 1 | |
r 2 | 0.99 | 0.99 | 0.89 | 0.45 | 0.90 | 0.93 | 0.83 | 0.44 | |
SEE | 0.03 | 0.04 | 0.10 | 0.23 | 0.10 | 0.08 | 0.13 | 0.21 | |
S | 0.53 | 0.54 | 0.70 | 0.53 | 0.55 | 0.67 | 0.41 | 0.00 | |
E | 0.47 | 0.46 | 0.30 | 0.48 | 0.45 | 0.33 | 0.59 | 1.00 |
a: q2LOO, leave-one-out cross-validated coefficient; b: SEP, standard error of prediction; c: N, number of PLS components; d: r2, regression coefficient without validation; e: SEE, standard non-cross validated error; f: S, steric contribution; g: E, electrostatic contribution. h: w = weight; i: d (Å) = distance between grid points; the best statistical model is highlighted in bold.