Frequencies for first 10,000 rows of vpavetyp variable in vehicle dataset :

    roadway |
    surface |
       type |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         72        0.72        0.72
          1 |      1,023       10.23       10.95
          2 |      6,310       63.10       74.05
          3 |          1        0.01       74.06
          4 |         28        0.28       74.34
          5 |         71        0.71       75.05
          7 |          4        0.04       75.09
          8 |      2,485       24.85       99.94
          9 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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