Frequencies for first 10,000 rows of dr_sf3 variable in vehicle dataset :

     Driver |
    Related |
 Factors (4 |
   choices) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,400       94.00       94.00
          8 |          1        0.01       94.01
         18 |          1        0.01       94.02
         24 |          5        0.05       94.07
         27 |          1        0.01       94.08
         28 |          4        0.04       94.12
         33 |          3        0.03       94.15
         34 |          1        0.01       94.16
         35 |          4        0.04       94.20
         36 |          5        0.05       94.25
         37 |          5        0.05       94.30
         38 |          4        0.04       94.34
         39 |         10        0.10       94.44
         48 |          7        0.07       94.51
         51 |          4        0.04       94.55
         52 |          5        0.05       94.60
         53 |          1        0.01       94.61
         54 |          1        0.01       94.62
         58 |         18        0.18       94.80
         73 |          5        0.05       94.85
         74 |         10        0.10       94.95
         80 |          2        0.02       94.97
         87 |          1        0.01       94.98
         91 |         13        0.13       95.11
         92 |         43        0.43       95.54
         99 |        446        4.46      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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