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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,076       10.76       10.76
          2 |      1,217       12.17       22.93
          3 |         70        0.70       23.63
          4 |         33        0.33       23.96
          5 |         29        0.29       24.25
          6 |         38        0.38       24.63
          7 |         67        0.67       25.30
          8 |        524        5.24       30.54
          9 |        618        6.18       36.72
          . |      6,328       63.28      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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