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

Compare vibrational frequencies in CCCBDB for NH3 (Ammonia)

HF/LANL2DZ

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3398 61 A1 3337  
2 A1 525 -425 A1 950  
3 E 3594 150 E 3444  
4 E 1620 -7 E 1627  
The calculated vibrational frequencies were scaled by 0.8999

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.