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

     Weight |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         29        0.29        0.29
          1 |        965        9.65        9.94
          2 |        582        5.82       15.76
          3 |          1        0.01       15.77
          4 |          2        0.02       15.79
          5 |         20        0.20       15.99
          6 |         67        0.67       16.66
          7 |         17        0.17       16.83
          8 |        118        1.18       18.01
          9 |      3,223       32.23       50.24
          . |      4,976       49.76      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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