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

Compare vibrational frequencies in CCCBDB for NH3 (Ammonia)

LSDA/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3358 21 A1 3337  
2 A1 450 -500 A1 950  
3 E 3535 91 E 3444  
4 E 1624 -3 E 1627  
The calculated vibrational frequencies were scaled by 0.9836

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.