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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,162       11.62       11.62
          2 |      1,117       11.17       22.79
          3 |         65        0.65       23.44
          4 |         26        0.26       23.70
          5 |         15        0.15       23.85
          6 |         64        0.64       24.49
          7 |         78        0.78       25.27
          8 |        538        5.38       30.65
          9 |        569        5.69       36.34
          . |      6,366       63.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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