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

      Truck |
     Weight |
     Rating |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        969        9.69        9.69
          2 |      1,259       12.59       22.28
          3 |         92        0.92       23.20
          4 |         39        0.39       23.59
          5 |         15        0.15       23.74
          6 |         48        0.48       24.22
          7 |         66        0.66       24.88
          8 |        504        5.04       29.92
          . |      7,008       70.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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