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

     Weight |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        342        3.42        3.42
          1 |      1,031       10.31       13.73
          2 |        678        6.78       20.51
          3 |          1        0.01       20.52
          4 |          3        0.03       20.55
          5 |         15        0.15       20.70
          6 |         75        0.75       21.45
          7 |         25        0.25       21.70
          8 |        119        1.19       22.89
          9 |      1,830       18.30       41.19
          . |      5,881       58.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016