Frequencies for pwgtcd_tr variable in parkwork dataset :

      truck |
     weight |
     rating |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        121       11.09       11.09
          2 |        159       14.57       25.66
          3 |         27        2.47       28.14
          4 |          8        0.73       28.87
          5 |          8        0.73       29.61
          6 |         32        2.93       32.54
          7 |         14        1.28       33.82
          8 |         86        7.88       41.70
          . |        636       58.30      100.00
------------+-----------------------------------
      Total |      1,091      100.00

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