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

     driver |
    related |
 factors (4 |
   choices) |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,468       94.68       94.68
          6 |          3        0.03       94.71
          8 |          2        0.02       94.73
         16 |          1        0.01       94.74
         26 |          1        0.01       94.75
         27 |          1        0.01       94.76
         28 |          2        0.02       94.78
         31 |          1        0.01       94.79
         33 |          1        0.01       94.80
         34 |          1        0.01       94.81
         35 |          2        0.02       94.83
         36 |          7        0.07       94.90
         37 |          4        0.04       94.94
         38 |          2        0.02       94.96
         39 |         13        0.13       95.09
         40 |          1        0.01       95.10
         47 |          1        0.01       95.11
         48 |          5        0.05       95.16
         51 |          2        0.02       95.18
         52 |          7        0.07       95.25
         53 |          1        0.01       95.26
         54 |          1        0.01       95.27
         57 |          1        0.01       95.28
         58 |          9        0.09       95.37
         73 |          3        0.03       95.40
         74 |          4        0.04       95.44
         81 |          2        0.02       95.46
         84 |          1        0.01       95.47
         85 |          2        0.02       95.49
         87 |          2        0.02       95.51
         88 |          1        0.01       95.52
         91 |         21        0.21       95.73
         99 |        427        4.27      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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