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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,045       10.45       10.45
          2 |      1,201       12.01       22.46
          3 |         82        0.82       23.28
          4 |         34        0.34       23.62
          5 |         22        0.22       23.84
          6 |         63        0.63       24.47
          7 |         64        0.64       25.11
          8 |        587        5.87       30.98
          9 |        497        4.97       35.95
          . |      6,405       64.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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