Frequencies for pave_typ variable in accident dataset :

    Roadway |
    Surface |
       Type |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        126       25.77       25.77
          2 |        355       72.60       98.36
          4 |          5        1.02       99.39
          5 |          3        0.61      100.00
------------+-----------------------------------
      Total |        489      100.00

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