Table 3. Mean Absolute Errors in Heats of Formation, Enthalpy Changes, and Activation Enthalpies at 298 K (kcal/mol), Bond Lengths (Å), Bond Angles (deg), Ionization Potentials (eV), and Dipole Moments (D) Calculated with the OMx, OMx-D3T, and ODMx Methods for the CHNO Set and Its Subsets.

subset	N	OM2	OM2-D3T	ODM2	OM3	OM3-D3T	ODM3
Heats of Formation
overall	138	3.05	5.10	2.64	3.00	6.95	2.74
CH	57	1.72	4.98	1.60	1.63	7.72	1.46
CHN	32	3.92	4.88	2.88	3.80	6.77	3.36
CHO	37	4.40	6.24	4.01	4.05	6.87	3.83
CHNO	4	1.96	2.13	2.38	3.24	3.45	3.39
HNO	8	3.28	3.12	2.86	4.53	4.43	4.01
Bond Lengths
overall	242	0.016	0.016	0.015	0.019	0.019	0.015
CH	113	0.010	0.010	0.009	0.009	0.009	0.009
CHN	49	0.015	0.015	0.014	0.027	0.027	0.015
CHO	57	0.018	0.018	0.018	0.022	0.022	0.021
CHNO	5	0.018	0.018	0.023	0.033	0.033	0.019
HNO	18	0.049	0.049	0.044	0.043	0.043	0.033
Bond Angles
overall	101	2.24	2.24	2.04	1.85	1.86	1.70
CH	38	1.46	1.48	1.48	1.23	1.25	1.27
CHN	22	2.30	2.28	2.11	1.82	1.80	1.64
CHO	31	2.45	2.44	2.11	2.03	2.04	1.96
HNO	10	4.42	4.42	3.85	3.76	3.75	2.69
Ionization Potentials
overall	52	0.26	0.26	0.23	0.44	0.44	0.41
CH	22	0.24	0.24	0.19	0.37	0.37	0.30
CHN	13	0.22	0.22	0.22	0.39	0.39	0.39
CHO	14	0.34	0.34	0.29	0.61	0.61	0.61
HNO	3	0.23	0.23	0.22	0.45	0.45	0.36
Dipole Moments
overall	63	0.25	0.25	0.26	0.26	0.26	0.23
CH	20	0.11	0.11	0.10	0.10	0.10	0.09
CHN	16	0.27	0.27	0.27	0.33	0.33	0.32
CHO	19	0.31	0.31	0.38	0.26	0.26	0.24
HNO	6	0.49	0.49	0.41	0.58	0.58	0.44
Enthalpy Changes at 298 K
overall	17	1.96	1.94	2.05	2.83	2.65	3.34
CH	9	0.52	0.48	0.41	1.08	0.76	0.85
CHN	3	4.09	4.07	3.57	5.65	5.63	8.11
CHO	3	3.63	3.67	4.67	3.91	3.98	4.20
Activation Enthalpies at 298 K
overall	60	1.55	1.55	1.77	1.53	1.48	2.01
CH	20	1.63	1.62	1.88	1.96	1.94	2.33
CHN	10	1.92	1.88	2.06	1.51	1.21	2.63
CHO	25	1.35	1.36	1.49	1.31	3.2	1.52
CHNO	3	1.43	1.44	2.40	0.68	0.68	2.19