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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,005       10.05       10.05
          2 |      1,269       12.69       22.74
          3 |         74        0.74       23.48
          4 |         29        0.29       23.77
          5 |         24        0.24       24.01
          6 |         58        0.58       24.59
          7 |         60        0.60       25.19
          8 |        449        4.49       29.68
          9 |        478        4.78       34.46
          . |      6,554       65.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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