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Energy differences between frozen core and all electrons correlated.
MP2, MP3, MP4, B2PLYP, CCSD, and CCSD(T)

For HO2- (Hydroperoxy anion)

Energies in Hartree
Methods with standard basis sets
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ aug-cc-pVTZ
Moller Plesset perturbation MP2=FULL -0.000160 -0.003585 -0.003585 -0.002042 -0.004665 -0.004797 -0.005279 -0.037151 -0.037261 -0.013457 -0.004184 -0.024777 -0.027843
MP3=FULL         -0.004208   -0.054503            
Coupled Cluster CCSD(T)=FULL         -0.004204                
STO-3G 3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) cc-pVDZ cc-pVTZ aug-cc-pVTZ