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IV.C.1. (XIII.D.1.)

Compare vibrational frequencies in CCCBDB for H2OH2O (water dimer)

CISD/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3433 -302 A' 3735  
2 A' 3352 -308 A' 3660  
3 A' 3294 -307 A' 3601  
4 A' 1697 81 A' 1616  
5 A' 1637 38 A' 1599  
6 A' 485 174 A' 311  
7 A' 253 110 A' 143  
8 A' 203 100 A' 103  
9 A" 3473 -272 A" 3745  
10 A" 778 255 A" 523  
11 A" 207 99 A" 108  
12 A" 133 45 A" 88  
The calculated vibrational frequencies were scaled by 0.939

See section XIII.C.3 List or set vibrational scaling factors to change the scale factors used here.
See section III.B.3.c Calculate a vibrational scaling factor for a set of molecules to determine the least squares best scaling factor.
See section III.B.3.b List of vibrational scaling factors and their uncertainties for information on where the above scaling factor is from.