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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,340       23.40       23.40
          2 |      1,075       10.75       34.15
          3 |         47        0.47       34.62
          4 |         27        0.27       34.89
          5 |          8        0.08       34.97
          6 |         52        0.52       35.49
          7 |        101        1.01       36.50
          8 |        522        5.22       41.72
          9 |        708        7.08       48.80
          . |      5,120       51.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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