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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,588       15.88       15.88
          2 |        870        8.70       24.58
          3 |         47        0.47       25.05
          4 |         18        0.18       25.23
          5 |         11        0.11       25.34
          6 |         57        0.57       25.91
          7 |         98        0.98       26.89
          8 |        457        4.57       31.46
          9 |        470        4.70       36.16
          . |      6,384       63.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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