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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,402       14.02       14.02
          2 |        970        9.70       23.72
          3 |         59        0.59       24.31
          4 |         39        0.39       24.70
          5 |         14        0.14       24.84
          6 |         45        0.45       25.29
          7 |         89        0.89       26.18
          8 |        557        5.57       31.75
          9 |        579        5.79       37.54
          . |      6,246       62.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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