Frequencies for wgtcd_tr variable in vehicle dataset :

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         47        9.96        9.96
          2 |         13        2.75       12.71
          3 |          3        0.64       13.35
          6 |          1        0.21       13.56
          7 |          4        0.85       14.41
          8 |         10        2.12       16.53
          9 |         82       17.37       33.90
          . |        312       66.10      100.00
------------+-----------------------------------
      Total |        472      100.00

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