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

      TRUCK |
WEIGHT CODE |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,321       13.21       13.21
          2 |        786        7.86       21.07
          3 |         65        0.65       21.72
          4 |         27        0.27       21.99
          5 |          8        0.08       22.07
          6 |         43        0.43       22.50
          7 |         86        0.86       23.36
          8 |        525        5.25       28.61
          9 |      1,275       12.75       41.36
          . |      5,864       58.64      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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