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

    roadway |
    surface |
       type |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         52        0.52        0.52
          1 |      1,041       10.41       10.93
          2 |      6,433       64.33       75.26
          3 |          1        0.01       75.27
          4 |         29        0.29       75.56
          5 |         82        0.82       76.38
          7 |          4        0.04       76.42
          8 |      2,335       23.35       99.77
          9 |         23        0.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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