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

Compare vibrational frequencies in CCCBDB for NH3 (Ammonia)

B1B95/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3287 -50 A1 3337  
2 A1 681 -269 A1 950  
3 E 3445 1 E 3444  
4 E 1661 34 E 1627  
The calculated vibrational frequencies were scaled by 0.9549

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.