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

     Weight |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          7        0.07        0.07
          1 |      1,415       14.15       14.22
          2 |        662        6.62       20.84
          3 |         20        0.20       21.04
          5 |         10        0.10       21.14
          6 |         72        0.72       21.86
          7 |         74        0.74       22.60
          8 |        301        3.01       25.61
          9 |      1,198       11.98       37.59
          . |      6,241       62.41      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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