Frequencies for l_type variable in vehicle dataset :

    NON-CDL |
    LICENCE |
       TYPE |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         61        9.74        9.74
          1 |        480       76.68       86.42
          7 |         26        4.15       90.58
          9 |         58        9.27       99.84
          . |          1        0.16      100.00
------------+-----------------------------------
      Total |        626      100.00

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