Frequencies for first 10,000 rows of dr_sf4 variable in vehicle dataset :

     Driver |
    Related |
 Factors (4 |
   choices) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,557       95.57       95.57
         27 |          1        0.01       95.58
         28 |          1        0.01       95.59
         36 |          1        0.01       95.60
         38 |          1        0.01       95.61
         39 |          2        0.02       95.63
         48 |          1        0.01       95.64
         58 |          1        0.01       95.65
         91 |          6        0.06       95.71
         92 |          6        0.06       95.77
         99 |        423        4.23      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016