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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,014       10.14       10.14
          2 |      1,170       11.70       21.84
          3 |         61        0.61       22.45
          4 |         38        0.38       22.83
          5 |         21        0.21       23.04
          6 |         56        0.56       23.60
          7 |         71        0.71       24.31
          8 |        544        5.44       29.75
          9 |        512        5.12       34.87
          . |      6,513       65.13      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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