Table 1. Error Statistics (MAE and MARE) of Several Thermochemistry Properties^g.

			@OEPx
	MP2	OEP2-sc	GL2	ISIf	mISIf	mISIe	ACSC
Correlation Energies (9 Atoms and 27 Molecules)
MAEa	24.4	18.4	95.4	42.3	34.9	85.9	73.6
MAREb	10.5	8.7	26.6	10.4	8.3	21.4	16.9
Atomization Energies (27 Molecules)
MAEcI	5.5	8.0	37.8	16.8	15.1	14.8	17.8
MAREb	5.2	7.3	31.6	15.2	13.4	13.2	17.2
Atomization Energies (AE6 Test)
MAEcI	12.2	17.1	82.1	32.7	23.6	25.5	21.0
MAREb	3.7	5.6	23.6	13.6	11.7	7.5	6.9
Atomization Energies (Small Radicals)
MAEcI	6.1	15.7	53.0	21.7	16.6	30.3	34.2
MAREb	3.9	12.1	89.1	17.0	12.2	31.1	46.4
Kinetics (K9 Test)
MAEcI	2.8	14.9	18.9	16.0	15.0	15.9	14.8
MAREb	22.5	46.5	75.9	45.5	37.8	68.3	68.6
HTR Test
MAEcI	13.5	2.2	25.4	14.8	12.2	2.9	2.8
MAREb	143.5	32.6	259.5	150.2	119.0	29.5	34.0
21 Isomerization Energies (ISO21 Test)
MAEcI	0.89	0.39	20.71	12.48	10.97	7.16	6.61
MAREb	7.97	16.59	96.60	42.74	23.87	82.39	84.89
31 Closed-Shell Reaction Energies
MAEcI	2.0	3.0	10.6	4.7	4.6	11.4	10.3
MAREb	46.8	34.5	106.3	54.5	57.3	144.8	125.7
26 Open-Shell Reaction Energies
MAEcI	4.3	3.4	18.3	11.5	10.4	12.2	11.6
MAREb	12.3	12.7	51.5	34.6	29.5	35.6	30.2
32 Vertical Ionization Potentials (VIP)
MAEd	0.2	0.2	1.2	0.6	0.5	0.4	0.4
MAREb	2.4	1.2	9.0	4.9	4.3	3.8	3.6

^aIn mHa.

^bIn %.

^cIn kcal/mol.

^dIn eV.

^eWith TPSS-GL2.

^fCorrected for size-consistency error (see ref (61)).

^gThe best result between ISI and mISI of each line is highlighted in bold style. The full results of all tests are reported in ref (70). The OEP2-sc results are fully self-consistent, the MP2 and (reference) CCSD(T) results are calculated on top of HF orbitals, and the results of the other methods (GL2, ISI, mISI, mISI@TPSS-GL2, ACSC) are computed on top of OEPx orbitals.