Frequencies for pgvwr variable in parkwork dataset :

      gross |
    vehicle |
     weight |
     rating |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        928       81.91       81.91
          2 |         47        4.15       86.05
          3 |        156       13.77       99.82
          8 |          1        0.09       99.91
          9 |          1        0.09      100.00
------------+-----------------------------------
      Total |      1,133      100.00

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