Frequencies for v_config variable in vehicle dataset :

    VEHICLE |
CONFIGURATI |
         ON |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        683       89.40       89.40
          5 |          5        0.65       90.05
          7 |         29        3.80       93.85
          8 |          4        0.52       94.37
          9 |         43        5.63      100.00
------------+-----------------------------------
      Total |        764      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016