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

     Weight |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         17        0.17        0.17
          1 |      1,187       11.87       12.04
          2 |        687        6.87       18.91
          3 |          4        0.04       18.95
          4 |          2        0.02       18.97
          5 |         13        0.13       19.10
          6 |         65        0.65       19.75
          7 |         29        0.29       20.04
          8 |        274        2.74       22.78
          9 |      1,706       17.06       39.84
          . |      6,016       60.16      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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