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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,618       16.18       16.18
          2 |        707        7.07       23.25
          3 |         50        0.50       23.75
          4 |         17        0.17       23.92
          5 |          8        0.08       24.00
          6 |         47        0.47       24.47
          7 |         62        0.62       25.09
          8 |        437        4.37       29.46
          9 |        789        7.89       37.35
          . |      6,265       62.65      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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