Frequencies for pgvwr variable in parkwork dataset :

      gross |
    vehicle |
     weight |
     rating |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        903       82.92       82.92
          1 |          1        0.09       83.01
          2 |         64        5.88       88.89
          3 |        118       10.84       99.72
          8 |          1        0.09       99.82
          9 |          2        0.18      100.00
------------+-----------------------------------
      Total |      1,089      100.00

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