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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,418       14.18       14.18
          2 |        962        9.62       23.80
          3 |         67        0.67       24.47
          4 |         32        0.32       24.79
          5 |         14        0.14       24.93
          6 |         65        0.65       25.58
          7 |        102        1.02       26.60
          8 |        556        5.56       32.16
          9 |        557        5.57       37.73
          . |      6,227       62.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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