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

     Weight |
 Code-Truck |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         25        0.25        0.25
          1 |        666        6.66        6.91
          2 |        257        2.57        9.48
          4 |          4        0.04        9.52
          5 |         25        0.25        9.77
          6 |         57        0.57       10.34
          7 |          9        0.09       10.43
          8 |         20        0.20       10.63
          9 |      4,733       47.33       57.96
          . |      4,204       42.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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