Frequencies for wgtcd_tr variable in vehicle dataset :

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         55        7.59        7.59
          2 |         17        2.34        9.93
          3 |          3        0.41       10.34
          4 |          5        0.69       11.03
          6 |          1        0.14       11.17
          7 |          4        0.55       11.72
          8 |         13        1.79       13.52
          9 |        150       20.69       34.21
          . |        477       65.79      100.00
------------+-----------------------------------
      Total |        725      100.00

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