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

      truck |
     weight |
     rating |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        968        9.68        9.68
          2 |      1,158       11.58       21.26
          3 |         76        0.76       22.02
          4 |         21        0.21       22.23
          5 |         19        0.19       22.42
          6 |         50        0.50       22.92
          7 |         58        0.58       23.50
          8 |        511        5.11       28.61
          . |      7,139       71.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Oct 2016