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

     Weight |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         23        0.23        0.23
          1 |        916        9.16        9.39
          2 |        483        4.83       14.22
          3 |          2        0.02       14.24
          4 |          3        0.03       14.27
          5 |         13        0.13       14.40
          6 |         76        0.76       15.16
          7 |         15        0.15       15.31
          8 |        112        1.12       16.43
          9 |      3,756       37.56       53.99
          . |      4,601       46.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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