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

Compare vibrational frequencies in CCCBDB for NH2- (amino anion)

MP4/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 2497 -625 A1 3122  
2 A1 1564 41 A1 1523  
3 B2 2542 -648 B2 3190  
The calculated vibrational frequencies were scaled by 0.9698

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.