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

Compare vibrational frequencies in CCCBDB for CH3 (Methyl radical)

MP2/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1' 3033 29 A1' 3004  
2 A2" 403 -203 A2" 606  
3 E' 3207 46 E' 3161  
4 E' 1442 46 E' 1396  
The calculated vibrational frequencies were scaled by 0.9545

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.