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

     Weight |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          6        0.06        0.06
          1 |      1,544       15.44       15.50
          2 |        674        6.74       22.24
          3 |         17        0.17       22.41
          4 |          2        0.02       22.43
          5 |          9        0.09       22.52
          6 |         52        0.52       23.04
          7 |         66        0.66       23.70
          8 |        351        3.51       27.21
          9 |      1,196       11.96       39.17
          . |      6,083       60.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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