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

     Weight |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        369        3.69        3.69
          1 |        927        9.27       12.96
          2 |        602        6.02       18.98
          3 |          1        0.01       18.99
          4 |          2        0.02       19.01
          5 |         11        0.11       19.12
          6 |         84        0.84       19.96
          7 |         20        0.20       20.16
          8 |        150        1.50       21.66
          9 |      2,319       23.19       44.85
          . |      5,515       55.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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