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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,044       10.44       10.44
          2 |      1,224       12.24       22.68
          3 |         83        0.83       23.51
          4 |         34        0.34       23.85
          5 |         16        0.16       24.01
          6 |         40        0.40       24.41
          7 |         84        0.84       25.25
          8 |        539        5.39       30.64
          9 |        568        5.68       36.32
          . |      6,368       63.68      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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