Frequencies for pgvwr variable in parkwork dataset :

      gross |
    vehicle |
     weight |
     rating |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        908       83.23       83.23
          2 |         68        6.23       89.46
          3 |        112       10.27       99.73
          9 |          3        0.27      100.00
------------+-----------------------------------
      Total |      1,091      100.00

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