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

    roadway |
    surface |
       type |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         65        0.65        0.65
          1 |      1,133       11.33       11.98
          2 |      6,403       64.03       76.01
          4 |         47        0.47       76.48
          5 |         70        0.70       77.18
          7 |          3        0.03       77.21
          8 |      2,253       22.53       99.74
          9 |         26        0.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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