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

     Driver |
    Related |
 Factors (4 |
   choices) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,535       95.35       95.35
          8 |          1        0.01       95.36
         23 |          1        0.01       95.37
         24 |          1        0.01       95.38
         27 |          2        0.02       95.40
         28 |          1        0.01       95.41
         29 |          1        0.01       95.42
         35 |          1        0.01       95.43
         36 |          1        0.01       95.44
         37 |          1        0.01       95.45
         39 |          1        0.01       95.46
         47 |          1        0.01       95.47
         48 |          1        0.01       95.48
         58 |          2        0.02       95.50
         73 |          1        0.01       95.51
         92 |          3        0.03       95.54
         99 |        446        4.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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