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

     Weight |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          7        0.07        0.07
          1 |      1,506       15.06       15.13
          2 |        741        7.41       22.54
          3 |         20        0.20       22.74
          4 |          4        0.04       22.78
          5 |          5        0.05       22.83
          6 |         72        0.72       23.55
          7 |         57        0.57       24.12
          8 |        356        3.56       27.68
          9 |      1,236       12.36       40.04
          . |      5,996       59.96      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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