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Bond Length differences between FULL (all electrons correlated) and FROZEN core

Such as MP2=Frozen and MP2=Full
17 10 27 16 27

For Ar2 atoms 1 and 2

For Ar2 (Argon diatomic)
Bond length differences (full - frozen) in Å. Mouse over a difference for the bond length with full correlation.
Methods with standard basis sets
3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ
Moller Plesset perturbation MP2=FULL 0.0132 0.0200 0.0342 0.0321 0.0321 0.0078 0.0155 0.0155 0.0514 0.0600 0.0211 0.0635 0.0336 0.0208 0.0842 0.0450
MP3=FULL       0.0327   0.0058       0.0588 0.0171 0.0717        
MP4=FULL 0.0129     0.0343       0.0167     0.0159 0.0738   0.0201 0.0871  
B2PLYP=FULL 0.0016 0.0000 0.0044 0.0112 0.0111 0.0062 0.0037 0.0037 0.0143 0.0105 0.0053 0.0259   0.0168 0.2020  
Quadratic configuration interaction QCISD(T)=FULL       0.0342             0.0156 0.0716   0.0194 0.0859  
Coupled Cluster CCSD=FULL       0.0332         0.0486 0.0593 0.0099 0.0778 0.0389 0.0199 0.0985 0.0586
CCSD(T)=FULL       0.0341           0.0623 0.0156 0.0722 0.0419 0.0193 0.0865 0.0476
3-21G 3-21G* 6-31G 6-31G* 6-31G** 6-31+G** 6-311G* 6-311G** 6-31G(2df,p) TZVP cc-pVDZ cc-pVTZ cc-pVQZ aug-cc-pVDZ aug-cc-pVTZ aug-cc-pVQZ

ar2q1.gif