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

Compare vibrational frequencies in CCCBDB for CH2CO (Ketene)

BLYP/STO-3G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3056 -15 A1 3070  
2 A1 2037 -115 A1 2152  
3 A1 1376 -12 A1 1388  
4 A1 1050 -68 A1 1118  
5 B1 572 -16 B1 588  
6 B1 382 -146 B1 528  
7 B2 3186 20 B2 3166  
8 B2 945 -32 B2 977  
9 B2 357 -76 B2 433  
The calculated vibrational frequencies were scaled by 0.9252

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.