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

     Weight |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,608       16.08       16.08
          2 |        654        6.54       22.62
          3 |         27        0.27       22.89
          4 |         12        0.12       23.01
          5 |         11        0.11       23.12
          6 |         57        0.57       23.69
          7 |         85        0.85       24.54
          8 |        378        3.78       28.32
          9 |        880        8.80       37.12
          . |      6,288       62.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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