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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,196       11.96       11.96
          2 |      1,141       11.41       23.37
          3 |         67        0.67       24.04
          4 |         33        0.33       24.37
          5 |         17        0.17       24.54
          6 |         53        0.53       25.07
          7 |         64        0.64       25.71
          8 |        524        5.24       30.95
          9 |        552        5.52       36.47
          . |      6,353       63.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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