Frequencies for pwgtcd_tr variable in parkwork dataset :

      Truck |
     Weight |
     Rating |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        122       11.47       11.47
          2 |        137       12.88       24.34
          3 |         15        1.41       25.75
          4 |         10        0.94       26.69
          5 |         11        1.03       27.73
          6 |         19        1.79       29.51
          7 |          8        0.75       30.26
          8 |        100        9.40       39.66
          . |        642       60.34      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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