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

     Weight |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        312        3.12        3.12
          1 |      1,013       10.13       13.25
          2 |        669        6.69       19.94
          3 |          5        0.05       19.99
          4 |          2        0.02       20.01
          5 |          7        0.07       20.08
          6 |         68        0.68       20.76
          7 |         18        0.18       20.94
          8 |        136        1.36       22.30
          9 |      1,699       16.99       39.29
          . |      6,071       60.71      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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