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

    roadway |
    surface |
       type |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         75        0.75        0.75
          1 |      1,183       11.83       12.58
          2 |      6,490       64.90       77.48
          3 |          1        0.01       77.49
          4 |         31        0.31       77.80
          5 |         60        0.60       78.40
          7 |          2        0.02       78.42
          8 |      2,022       20.22       98.64
          9 |        136        1.36      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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