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

Compare vibrational frequencies in CCCBDB for NH2CN (cyanamide)

MP4/6-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3371 -49 A' 3420 NH2 s-str
2 A' 2129 -141 A' 2270 C#N str
3 A' 1608 13 A' 1595 NH2 scissors
4 A' 1011 -44 A' 1055 C-N str
5 A' 673 265 A' 408 NH2 wag 0- 49, 1+ 413.6, 1- 714.1
6 A' 420 -67 A' 487 NCN bend
7 A" 3468 -12 A" 3480 NH2 a-str
8 A" 1175   A"   NH2 rock
9 A" 360 -75 A" 435 NCN bend
The calculated vibrational frequencies were scaled by 0.9548

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.