Table 5. MSE and RMSE Values (in kcal mol^–1) between the Set of Expected E_HB Values and Set of Predicted E_HB Values from Different Single Parameter and Multiparameter Models^a.

	MSE			RMSE
parameter	weak	strong	all	weak	strong	all
ρ	0.32	0.33	0.33	0.56	0.58	0.58
∇2ρ	0.59	0.63	0.62	0.77	0.79	0.79
E(2)	0.20	0.25	0.23	0.45	0.50	0.49
H–A	0.44	0.49	0.47	0.66	0.7	0.69
D–H	0.17	0.16	0.17	0.41	0.4	0.41
3-P model	0.54	0.20	0.30	0.74	0.45	0.55
5-P model	0.12	0.07	0.09	0.34	0.28	0.30

^a“Weak” and “strong” correspond to H-bonds with E_HB < 4 and 15 kcal mol^–1 ≥ E_HB ≥ 4 kcal mol^–1, respectively.