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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,569       15.69       15.69
          2 |        833        8.33       24.02
          3 |         60        0.60       24.62
          4 |         23        0.23       24.85
          5 |         10        0.10       24.95
          6 |         58        0.58       25.53
          7 |         84        0.84       26.37
          8 |        548        5.48       31.85
          9 |        493        4.93       36.78
          . |      6,322       63.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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