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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,580       15.80       15.80
          2 |        800        8.00       23.80
          3 |         52        0.52       24.32
          4 |         15        0.15       24.47
          5 |          6        0.06       24.53
          6 |         50        0.50       25.03
          7 |         87        0.87       25.90
          8 |        441        4.41       30.31
          9 |        502        5.02       35.33
          . |      6,467       64.67      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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