Frequencies for pgvwr variable in parkwork dataset :

      Gross |
    vehicle |
     weight |
     rating |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        899       84.49       84.49
          1 |          1        0.09       84.59
          2 |         49        4.61       89.19
          3 |        109       10.24       99.44
          8 |          2        0.19       99.62
          9 |          4        0.38      100.00
------------+-----------------------------------
      Total |      1,064      100.00

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