Frequencies for wgtcd_tr variable in vehicle dataset :

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         62        8.12        8.12
          2 |         31        4.06       12.17
          3 |          1        0.13       12.30
          4 |          2        0.26       12.57
          6 |          4        0.52       13.09
          7 |          4        0.52       13.61
          8 |          9        1.18       14.79
          9 |         98       12.83       27.62
          . |        553       72.38      100.00
------------+-----------------------------------
      Total |        764      100.00

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