Frequencies for first 10,000 rows of wgtcd_tr variable in vehicle dataset :

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,291       12.91       12.91
          2 |      1,059       10.59       23.50
          3 |         56        0.56       24.06
          4 |         30        0.30       24.36
          5 |          7        0.07       24.43
          6 |         48        0.48       24.91
          7 |         90        0.90       25.81
          8 |        476        4.76       30.57
          9 |        571        5.71       36.28
          . |      6,372       63.72      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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